diff --git a/package-lock.json b/package-lock.json
index d1760025b..cfdc59dac 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -29,6 +29,7 @@
         "marked-katex-extension": "^5.1.8",
         "marked-linkify-it": "^3.1.15",
         "md5": "^2.3.0",
+        "mermaid": "^11.14.0",
         "svelte": "^5.55.4",
         "twemoji": "^14.0.2",
         "zod": "^4.3.6"
@@ -69,6 +70,62 @@
         "node": ">=24"
       }
     },
+    "node_modules/@antfu/install-pkg": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@antfu/install-pkg/-/install-pkg-1.1.0.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "package-manager-detector": "^1.3.0",
+        "tinyexec": "^1.0.1"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/antfu"
+      }
+    },
+    "node_modules/@braintree/sanitize-url": {
+      "version": "7.1.2",
+      "resolved": "https://registry.npmjs.org/@braintree/sanitize-url/-/sanitize-url-7.1.2.tgz",
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+      "license": "MIT"
+    },
+    "node_modules/@chevrotain/cst-dts-gen": {
+      "version": "12.0.0",
+      "resolved": "https://registry.npmjs.org/@chevrotain/cst-dts-gen/-/cst-dts-gen-12.0.0.tgz",
+      "integrity": "sha512-fSL4KXjTl7cDgf0B5Rip9Q05BOrYvkJV/RrBTE/bKDN096E4hN/ySpcBK5B24T76dlQ2i32Zc3PAE27jFnFrKg==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@chevrotain/gast": "12.0.0",
+        "@chevrotain/types": "12.0.0"
+      }
+    },
+    "node_modules/@chevrotain/gast": {
+      "version": "12.0.0",
+      "resolved": "https://registry.npmjs.org/@chevrotain/gast/-/gast-12.0.0.tgz",
+      "integrity": "sha512-1ne/m3XsIT8aEdrvT33so0GUC+wkctpUPK6zU9IlOyJLUbR0rg4G7ZiApiJbggpgPir9ERy3FRjT6T7lpgetnQ==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "@chevrotain/types": "12.0.0"
+      }
+    },
+    "node_modules/@chevrotain/regexp-to-ast": {
+      "version": "12.0.0",
+      "resolved": "https://registry.npmjs.org/@chevrotain/regexp-to-ast/-/regexp-to-ast-12.0.0.tgz",
+      "integrity": "sha512-p+EW9MaJwgaHguhoqwOtx/FwuGr+DnNn857sXWOi/mClXIkPGl3rn7hGNWvo31HA3vyeQxjqe+H36yZJwYU8cA==",
+      "license": "Apache-2.0"
+    },
+    "node_modules/@chevrotain/types": {
+      "version": "12.0.0",
+      "resolved": "https://registry.npmjs.org/@chevrotain/types/-/types-12.0.0.tgz",
+      "integrity": "sha512-S+04vjFQKeuYw0/eW3U52LkAHQsB1ASxsPGsLPUyQgrZ2iNNibQrsidruDzjEX2JYfespXMG0eZmXlhA6z7nWA==",
+      "license": "Apache-2.0"
+    },
+    "node_modules/@chevrotain/utils": {
+      "version": "12.0.0",
+      "resolved": "https://registry.npmjs.org/@chevrotain/utils/-/utils-12.0.0.tgz",
+      "integrity": "sha512-lB59uJoaGIfOOL9knQqQRfhl9g7x8/wqFkp13zTdkRu1huG9kg6IJs1O8hqj9rs6h7orGxHJUKb+mX3rPbWGhA==",
+      "license": "Apache-2.0"
+    },
     "node_modules/@emnapi/core": {
       "version": "1.9.2",
       "resolved": "https://registry.npmjs.org/@emnapi/core/-/core-1.9.2.tgz",
@@ -351,6 +408,23 @@
         "url": "https://github.com/sponsors/nzakas"
       }
     },
+    "node_modules/@iconify/types": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/@iconify/types/-/types-2.0.0.tgz",
+      "integrity": "sha512-+wluvCrRhXrhyOmRDJ3q8mux9JkKy5SJ/v8ol2tu4FVjyYvtEzkc/3pK15ET6RKg4b4w4BmTk1+gsCUhf21Ykg==",
+      "license": "MIT"
+    },
+    "node_modules/@iconify/utils": {
+      "version": "3.1.2",
+      "resolved": "https://registry.npmjs.org/@iconify/utils/-/utils-3.1.2.tgz",
+      "integrity": "sha512-jVf75icVVgSVGf9+QWBeCHdFL35yZ06HMHl9sCa059pITTP781lOacvRazfwAmXDKiBiUdQQMWVnuiw/RaQNhQ==",
+      "license": "MIT",
+      "dependencies": {
+        "@antfu/install-pkg": "^1.1.0",
+        "@iconify/types": "^2.0.0",
+        "import-meta-resolve": "^4.2.0"
+      }
+    },
     "node_modules/@jridgewell/gen-mapping": {
       "version": "0.3.13",
       "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.13.tgz",
@@ -396,6 +470,15 @@
         "@jridgewell/sourcemap-codec": "^1.4.14"
       }
     },
+    "node_modules/@mermaid-js/parser": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@mermaid-js/parser/-/parser-1.1.0.tgz",
+      "integrity": "sha512-gxK9ZX2+Fex5zu8LhRQoMeMPEHbc73UKZ0FQ54YrQtUxE1VVhMwzeNtKRPAu5aXks4FasbMe4xB4bWrmq6Jlxw==",
+      "license": "MIT",
+      "dependencies": {
+        "langium": "^4.0.0"
+      }
+    },
     "node_modules/@napi-rs/wasm-runtime": {
       "version": "1.1.4",
       "resolved": "https://registry.npmjs.org/@napi-rs/wasm-runtime/-/wasm-runtime-1.1.4.tgz",
@@ -823,6 +906,259 @@
         "assertion-error": "^2.0.1"
       }
     },
+    "node_modules/@types/d3": {
+      "version": "7.4.3",
+      "resolved": "https://registry.npmjs.org/@types/d3/-/d3-7.4.3.tgz",
+      "integrity": "sha512-lZXZ9ckh5R8uiFVt8ogUNf+pIrK4EsWrx2Np75WvF/eTpJ0FMHNhjXk8CKEx/+gpHbNQyJWehbFaTvqmHWB3ww==",
+      "license": "MIT",
+      "dependencies": {
+        "@types/d3-array": "*",
+        "@types/d3-axis": "*",
+        "@types/d3-brush": "*",
+        "@types/d3-chord": "*",
+        "@types/d3-color": "*",
+        "@types/d3-contour": "*",
+        "@types/d3-delaunay": "*",
+        "@types/d3-dispatch": "*",
+        "@types/d3-drag": "*",
+        "@types/d3-dsv": "*",
+        "@types/d3-ease": "*",
+        "@types/d3-fetch": "*",
+        "@types/d3-force": "*",
+        "@types/d3-format": "*",
+        "@types/d3-geo": "*",
+        "@types/d3-hierarchy": "*",
+        "@types/d3-interpolate": "*",
+        "@types/d3-path": "*",
+        "@types/d3-polygon": "*",
+        "@types/d3-quadtree": "*",
+        "@types/d3-random": "*",
+        "@types/d3-scale": "*",
+        "@types/d3-scale-chromatic": "*",
+        "@types/d3-selection": "*",
+        "@types/d3-shape": "*",
+        "@types/d3-time": "*",
+        "@types/d3-time-format": "*",
+        "@types/d3-timer": "*",
+        "@types/d3-transition": "*",
+        "@types/d3-zoom": "*"
+      }
+    },
+    "node_modules/@types/d3-array": {
+      "version": "3.2.2",
+      "resolved": "https://registry.npmjs.org/@types/d3-array/-/d3-array-3.2.2.tgz",
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+    "node_modules/@types/d3-axis": {
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+      "resolved": "https://registry.npmjs.org/@types/d3-axis/-/d3-axis-3.0.6.tgz",
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+    "node_modules/roughjs": {
+      "version": "4.6.6",
+      "resolved": "https://registry.npmjs.org/roughjs/-/roughjs-4.6.6.tgz",
+      "integrity": "sha512-ZUz/69+SYpFN/g/lUlo2FXcIjRkSu3nDarreVdGGndHEBJ6cXPdKguS8JGxwj5HA5xIbVKSmLgr5b3AWxtRfvQ==",
+      "license": "MIT",
+      "dependencies": {
+        "hachure-fill": "^0.5.2",
+        "path-data-parser": "^0.1.0",
+        "points-on-curve": "^0.2.0",
+        "points-on-path": "^0.2.1"
+      }
+    },
+    "node_modules/rw": {
+      "version": "1.3.3",
+      "resolved": "https://registry.npmjs.org/rw/-/rw-1.3.3.tgz",
+      "integrity": "sha512-PdhdWy89SiZogBLaw42zdeqtRJ//zFd2PgQavcICDUgJT5oW10QCRKbJ6bg4r0/UY2M6BWd5tkxuGFRvCkgfHQ==",
+      "license": "BSD-3-Clause"
+    },
     "node_modules/rxjs": {
       "version": "7.8.2",
       "resolved": "https://registry.npmjs.org/rxjs/-/rxjs-7.8.2.tgz",
@@ -4061,6 +5126,12 @@
         "node": ">=6"
       }
     },
+    "node_modules/safer-buffer": {
+      "version": "2.1.2",
+      "resolved": "https://registry.npmjs.org/safer-buffer/-/safer-buffer-2.1.2.tgz",
+      "integrity": "sha512-YZo3K82SD7Riyi0E1EQPojLz7kpepnSQI9IyPbHHg1XXXevb5dJI7tpyN2ADxGcQbHG7vcyRHk0cbwqcQriUtg==",
+      "license": "MIT"
+    },
     "node_modules/section-matter": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/section-matter/-/section-matter-1.0.0.tgz",
@@ -4200,6 +5271,12 @@
         "url": "https://github.com/sponsors/sindresorhus"
       }
     },
+    "node_modules/stylis": {
+      "version": "4.4.0",
+      "resolved": "https://registry.npmjs.org/stylis/-/stylis-4.4.0.tgz",
+      "integrity": "sha512-5Z9ZpRzfuH6l/UAvCPAPUo3665Nk2wLaZU3x+TLHKVzIz33+sbJqbtrYoC3KD4/uVOr2Zp+L0LySezP9OHV9yA==",
+      "license": "MIT"
+    },
     "node_modules/svelte": {
       "version": "5.55.4",
       "resolved": "https://registry.npmjs.org/svelte/-/svelte-5.55.4.tgz",
@@ -4341,7 +5418,6 @@
       "version": "1.1.1",
       "resolved": "https://registry.npmjs.org/tinyexec/-/tinyexec-1.1.1.tgz",
       "integrity": "sha512-VKS/ZaQhhkKFMANmAOhhXVoIfBXblQxGX1myCQ2faQrfmobMftXeJPcZGp0gS07ocvGJWDLZGyOZDadDBqYIJg==",
-      "dev": true,
       "license": "MIT",
       "engines": {
         "node": ">=18"
@@ -4397,6 +5473,15 @@
         "typescript": ">=4.8.4"
       }
     },
+    "node_modules/ts-dedent": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/ts-dedent/-/ts-dedent-2.2.0.tgz",
+      "integrity": "sha512-q5W7tVM71e2xjHZTlgfTDoPF/SmqKG5hddq9SzR49CH2hayqRKJtQ4mtRlSxKaJlR/+9rEM+mnBHf7I2/BQcpQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.10"
+      }
+    },
     "node_modules/tslib": {
       "version": "2.8.1",
       "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.8.1.tgz",
@@ -4592,6 +5677,19 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/uuid": {
+      "version": "11.1.1",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-11.1.1.tgz",
+      "integrity": "sha512-vIYxrBCC/N/K+Js3qSN88go7kIfNPssr/hHCesKCQNAjmgvYS2oqr69kIufEG+O4+PfezOH4EbIeHCfFov8ZgQ==",
+      "funding": [
+        "https://github.com/sponsors/broofa",
+        "https://github.com/sponsors/ctavan"
+      ],
+      "license": "MIT",
+      "bin": {
+        "uuid": "dist/esm/bin/uuid"
+      }
+    },
     "node_modules/vfile": {
       "version": "6.0.3",
       "resolved": "https://registry.npmjs.org/vfile/-/vfile-6.0.3.tgz",
@@ -4823,6 +5921,49 @@
         }
       }
     },
+    "node_modules/vscode-jsonrpc": {
+      "version": "8.2.0",
+      "resolved": "https://registry.npmjs.org/vscode-jsonrpc/-/vscode-jsonrpc-8.2.0.tgz",
+      "integrity": "sha512-C+r0eKJUIfiDIfwJhria30+TYWPtuHJXHtI7J0YlOmKAo7ogxP20T0zxB7HZQIFhIyvoBPwWskjxrvAtfjyZfA==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=14.0.0"
+      }
+    },
+    "node_modules/vscode-languageserver": {
+      "version": "9.0.1",
+      "resolved": "https://registry.npmjs.org/vscode-languageserver/-/vscode-languageserver-9.0.1.tgz",
+      "integrity": "sha512-woByF3PDpkHFUreUa7Hos7+pUWdeWMXRd26+ZX2A8cFx6v/JPTtd4/uN0/jB6XQHYaOlHbio03NTHCqrgG5n7g==",
+      "license": "MIT",
+      "dependencies": {
+        "vscode-languageserver-protocol": "3.17.5"
+      },
+      "bin": {
+        "installServerIntoExtension": "bin/installServerIntoExtension"
+      }
+    },
+    "node_modules/vscode-languageserver-protocol": {
+      "version": "3.17.5",
+      "resolved": "https://registry.npmjs.org/vscode-languageserver-protocol/-/vscode-languageserver-protocol-3.17.5.tgz",
+      "integrity": "sha512-mb1bvRJN8SVznADSGWM9u/b07H7Ecg0I3OgXDuLdn307rl/J3A9YD6/eYOssqhecL27hK1IPZAsaqh00i/Jljg==",
+      "license": "MIT",
+      "dependencies": {
+        "vscode-jsonrpc": "8.2.0",
+        "vscode-languageserver-types": "3.17.5"
+      }
+    },
+    "node_modules/vscode-languageserver-textdocument": {
+      "version": "1.0.12",
+      "resolved": "https://registry.npmjs.org/vscode-languageserver-textdocument/-/vscode-languageserver-textdocument-1.0.12.tgz",
+      "integrity": "sha512-cxWNPesCnQCcMPeenjKKsOCKQZ/L6Tv19DTRIGuLWe32lyzWhihGVJ/rcckZXJxfdKCFvRLS3fpBIsV/ZGX4zA==",
+      "license": "MIT"
+    },
+    "node_modules/vscode-languageserver-types": {
+      "version": "3.17.5",
+      "resolved": "https://registry.npmjs.org/vscode-languageserver-types/-/vscode-languageserver-types-3.17.5.tgz",
+      "integrity": "sha512-Ld1VelNuX9pdF39h2Hgaeb5hEZM2Z3jUrrMgWQAu82jMtZp7p3vJT3BzToKtZI7NgQssZje5o0zryOrhQvzQAg==",
+      "license": "MIT"
+    },
     "node_modules/vscode-oniguruma": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/vscode-oniguruma/-/vscode-oniguruma-2.0.1.tgz",
@@ -4835,6 +5976,12 @@
       "integrity": "sha512-n2uGbUcrjhUEBH16uGA0TvUfhWwliFZ1e3+pTjrkim1Mt7ydB41lV08aUvsi70OlzDWp6X7Bx3w/x3fAXIsN0Q==",
       "license": "MIT"
     },
+    "node_modules/vscode-uri": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/vscode-uri/-/vscode-uri-3.1.0.tgz",
+      "integrity": "sha512-/BpdSx+yCQGnCvecbyXdxHDkuk55/G3xwnC0GqY4gmQ3j+A+g8kzzgB4Nk/SINjqn6+waqw3EgbVF2QKExkRxQ==",
+      "license": "MIT"
+    },
     "node_modules/wait-on": {
       "version": "9.0.5",
       "resolved": "https://registry.npmjs.org/wait-on/-/wait-on-9.0.5.tgz",
diff --git a/package.json b/package.json
index 55f26f6e6..a2bc716b5 100644
--- a/package.json
+++ b/package.json
@@ -78,6 +78,7 @@
     "marked-linkify-it": "^3.1.15",
     "md5": "^2.3.0",
     "svelte": "^5.55.4",
+    "mermaid": "^11.14.0",
     "twemoji": "^14.0.2",
     "zod": "^4.3.6"
   }
diff --git a/src/components/Markdown.svelte b/src/components/Markdown.svelte
index 5ccc12448..cc8153889 100644
--- a/src/components/Markdown.svelte
+++ b/src/components/Markdown.svelte
@@ -3,6 +3,7 @@
   import matter from "@radicle/gray-matter";
   import { afterUpdate } from "svelte";
   import { toDom } from "hast-util-to-dom";
+  import mermaid from "mermaid";
 
   import * as router from "@app/lib/router";
   import * as modal from "@app/lib/modal";
@@ -100,6 +101,12 @@
   }
 
   afterUpdate(async () => {
+    // Initialize mermaid with error handling configuration
+    mermaid.initialize({
+      startOnLoad: false,
+      securityLevel: 'loose',
+    });
+
     for (const e of container.querySelectorAll("a")) {
       try {
         const url = new URL(e.href);
@@ -210,7 +217,7 @@
 
     // Replaces code blocks in the background with highlighted code.
     const prefix = "language-";
-    const nodes = Array.from(document.body.querySelectorAll("pre code"));
+    const nodes = Array.from(container.querySelectorAll("pre code"));
 
     const treeChanges: Promise<void>[] = [];
 
@@ -231,8 +238,36 @@
       );
       if (!className) continue;
 
+      const language = className.slice(prefix.length);
+      
+      // Handle mermaid diagrams
+      if (language === 'mermaid') {
+        const mermaidCode = node.textContent || '';
+        try {
+          // First, validate the syntax without rendering
+          const isValid = await mermaid.parse(mermaidCode, { suppressErrors: true });
+          
+          if (isValid) {
+            // Generate a unique id for this diagram
+            const diagramId = `mermaid-${Math.random().toString(36).substr(2, 9)}`;
+            
+            // Try to render the mermaid diagram
+            const { svg } = await mermaid.render(diagramId, mermaidCode);
+            
+            // Replace the code block with the rendered diagram
+            const mermaidDiv = document.createElement('div');
+            mermaidDiv.innerHTML = svg;
+            mermaidDiv.classList.add('mermaid-diagram');
+            preWrapper.replaceWith(mermaidDiv);
+          }
+        } catch (error) {
+          // On any error, keep the raw text visible (do nothing, let it render as code)
+        }
+        continue;
+      }
+
       treeChanges.push(
-        highlight(node.textContent ?? "", className.slice(prefix.length))
+        highlight(node.textContent ?? "", language)
           .then(tree => {
             if (tree) {
               node.replaceChildren(toDom(tree, { fragment: true }));
@@ -500,6 +535,16 @@
   .markdown :global(dl dd) {
     margin: 0 0 0 2rem;
   }
+
+  .markdown :global(.mermaid-diagram) {
+    margin: 1rem 0;
+    text-align: center;
+  }
+
+  .markdown :global(.mermaid-diagram svg) {
+    max-width: 100%;
+    height: auto;
+  }
 </style>
 
 {#if frontMatter && frontMatter.length > 0}
diff --git a/tests/fixtures/repos/markdown.tar.bz2 b/tests/fixtures/repos/markdown.tar.bz2
index fd43e620c..4153d642e 100644
Binary files a/tests/fixtures/repos/markdown.tar.bz2 and b/tests/fixtures/repos/markdown.tar.bz2 differ
diff --git a/tests/visual/desktop/markdown.spec.ts b/tests/visual/desktop/markdown.spec.ts
index c2e9779a3..0b4a2c5ce 100644
--- a/tests/visual/desktop/markdown.spec.ts
+++ b/tests/visual/desktop/markdown.spec.ts
@@ -125,6 +125,23 @@ test("math", async ({ page }) => {
   await expect(page).toHaveScreenshot({ fullPage: true });
 });
 
+test("mermaid diagram", async ({ page }) => {
+  await page.goto(`${markdownUrl}/tree/main/mermaid.md`, {
+    waitUntil: "networkidle",
+  });
+  await expect(page.locator(".mermaid-diagram svg")).toBeVisible();
+  await expect(page).toHaveScreenshot({ fullPage: true });
+});
+
+test("broken mermaid falls back to code block", async ({ page }) => {
+  await page.goto(`${markdownUrl}/tree/main/mermaid-broken.md`, {
+    waitUntil: "networkidle",
+  });
+  await expect(page.locator("pre code.language-mermaid")).toBeVisible();
+  await expect(page.locator(".mermaid-diagram")).toHaveCount(0);
+  await expect(page).toHaveScreenshot({ fullPage: true });
+});
+
 test("relative image not able to being loaded", async ({ page }) => {
   await page.goto(`${markdownUrl}/tree/main/loading-image.md`, {
     waitUntil: "networkidle",