diff --git a/.github/workflows/docs-validation.yml b/.github/workflows/docs-validation.yml
index 91911bf2f6..32f4abafca 100644
--- a/.github/workflows/docs-validation.yml
+++ b/.github/workflows/docs-validation.yml
@@ -48,6 +48,17 @@ jobs:
             echo "✅ Valid: $file"
           done
 
+  toc-link-check:
+    name: Validate TOC Links
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v6
+
+      - name: Check TOC links exist
+        run: node bin/check-toc-links.js
+
   markdown-lint:
     name: Lint Markdown
     runs-on: ubuntu-latest
diff --git a/bin/check-toc-links.js b/bin/check-toc-links.js
new file mode 100644
index 0000000000..7955dcb028
--- /dev/null
+++ b/bin/check-toc-links.js
@@ -0,0 +1,131 @@
+#!/usr/bin/env node
+
+/**
+ * TOC Link Validator
+ *
+ * Validates that all links in toc_*.json files point to existing markdown files.
+ *
+ * Usage:
+ *   node bin/check-toc-links.js
+ */
+
+const fs = require("fs");
+const path = require("path");
+
+/**
+ * Recursively extract all links from TOC items
+ */
+function extractLinks(items, links = []) {
+  for (const item of items) {
+    if (item.link && !item.link.startsWith("http")) {
+      links.push(item.link);
+    }
+    if (item.items) {
+      extractLinks(item.items, links);
+    }
+  }
+  return links;
+}
+
+/**
+ * Check if a TOC link resolves to an existing file
+ */
+function checkLink(link, docsDir, lang) {
+  // TOC links may include language prefix: "/ja/quickstart" or just "/quickstart"
+  // Strip the language prefix if present
+  let relativePath = link.startsWith("/") ? link.slice(1) : link;
+
+  // Remove language prefix if link starts with it (e.g., "ja/quickstart" -> "quickstart")
+  const langPrefix = lang + "/";
+  if (relativePath.startsWith(langPrefix)) {
+    relativePath = relativePath.slice(langPrefix.length);
+  }
+
+  const filePath = path.join(docsDir, relativePath + ".md");
+
+  return fs.existsSync(filePath);
+}
+
+/**
+ * Extract language code from TOC filename
+ * e.g., "toc_en.json" -> "en"
+ */
+function getLangFromTocFile(tocFile) {
+  const match = tocFile.match(/^toc_(\w+)\.json$/);
+  return match ? match[1] : null;
+}
+
+/**
+ * Main validation function
+ */
+function validateTocFiles() {
+  const tocFiles = fs.readdirSync(".").filter((f) => f.match(/^toc_.*\.json$/));
+
+  if (tocFiles.length === 0) {
+    console.error("No toc_*.json files found");
+    process.exit(1);
+  }
+
+  let hasErrors = false;
+
+  for (const tocFile of tocFiles) {
+    const lang = getLangFromTocFile(tocFile);
+    if (!lang) {
+      console.error(`Could not extract language from ${tocFile}`);
+      continue;
+    }
+
+    const docsDir = path.join("docs", lang);
+    if (!fs.existsSync(docsDir)) {
+      console.error(`Docs directory not found: ${docsDir}`);
+      hasErrors = true;
+      continue;
+    }
+
+    console.log(`Checking ${tocFile} against ${docsDir}/...`);
+
+    const content = fs.readFileSync(tocFile, "utf8");
+    const toc = JSON.parse(content);
+
+    // TOC structure has keys like "/" with arrays of items
+    const allLinks = [];
+    for (const key of Object.keys(toc)) {
+      extractLinks(toc[key], allLinks);
+    }
+
+    const missingFiles = [];
+    for (const link of allLinks) {
+      if (!checkLink(link, docsDir, lang)) {
+        missingFiles.push(link);
+      }
+    }
+
+    if (missingFiles.length > 0) {
+      hasErrors = true;
+      console.error(`\n✗ ${tocFile}: ${missingFiles.length} broken link(s)\n`);
+      for (const link of missingFiles) {
+        // Calculate expected path (strip lang prefix if present)
+        let relativePath = link.startsWith("/") ? link.slice(1) : link;
+        const langPrefix = lang + "/";
+        if (relativePath.startsWith(langPrefix)) {
+          relativePath = relativePath.slice(langPrefix.length);
+        }
+        const expectedPath = path.join(docsDir, relativePath + ".md");
+        console.error(`  ${link}`);
+        console.error(`    Expected: ${expectedPath}`);
+      }
+      console.error("");
+    } else {
+      console.log(`✓ ${tocFile}: ${allLinks.length} link(s) valid\n`);
+    }
+  }
+
+  if (hasErrors) {
+    console.error("TOC validation failed");
+    process.exit(1);
+  }
+
+  console.log("✓ All TOC links are valid!");
+}
+
+validateTocFiles();