diff --git a/app/backend/src/routes/wiki-proposals.ts b/app/backend/src/routes/wiki-proposals.ts
new file mode 100644
index 0000000..41588ec
--- /dev/null
+++ b/app/backend/src/routes/wiki-proposals.ts
@@ -0,0 +1,126 @@
+import type { FastifyPluginAsync } from 'fastify';
+import { z } from 'zod';
+import { prisma } from '../db.js';
+import { requireAuth } from '../plugins/session.js';
+
+const submitWikiSchema = z.object({
+  articleId: z.string(),
+  title: z.string().min(1).max(200),
+  summary: z.string().min(1).max(500),
+  content: z.string().min(1).max(500_000),
+});
+
+const submitGlossarySchema = z.object({
+  term: z.string().min(1).max(100),
+  definition: z.string().min(1).max(50_000),
+  sameAs: z.array(z.string().url()).default([]),
+});
+
+const reviewProposalSchema = z.object({
+  status: z.enum(['approved', 'rejected']),
+  rejectionReason: z.string().optional(),
+});
+
+export const wikiProposalRoutes: FastifyPluginAsync = async (app) => {
+  app.addHook('preHandler', requireAuth());
+
+  // Submit a Wiki Edit Proposal
+  app.post('/api/v1/wiki/proposals', async (req, reply) => {
+    const parsed = submitWikiSchema.safeParse(req.body);
+    if (!parsed.success) return reply.code(400).send({ error: 'invalid_input', details: parsed.error.issues });
+
+    const article = await prisma.article.findUnique({ where: { id: parsed.data.articleId } });
+    if (!article) return reply.code(404).send({ error: 'article_not_found' });
+
+    const proposal = await prisma.wikiProposal.create({
+      data: {
+        articleId: article.id,
+        title: parsed.data.title,
+        summary: parsed.data.summary,
+        content: parsed.data.content,
+        suggestedById: req.session!.userId,
+      },
+    });
+
+    return { success: true, proposal };
+  });
+
+  // Submit a Glossary Proposal
+  app.post('/api/v1/glossary/proposals', async (req, reply) => {
+    const parsed = submitGlossarySchema.safeParse(req.body);
+    if (!parsed.success) return reply.code(400).send({ error: 'invalid_input', details: parsed.error.issues });
+
+    const proposal = await prisma.glossaryProposal.create({
+      data: {
+        term: parsed.data.term,
+        definition: parsed.data.definition,
+        sameAs: parsed.data.sameAs,
+        suggestedById: req.session!.userId,
+      },
+    });
+
+    return { success: true, proposal };
+  });
+
+  // Admin routes for reviewing proposals
+  app.register(async (adminApp) => {
+    adminApp.addHook('preHandler', async (req, reply) => {
+      if (req.session?.role !== 'admin' && req.session?.role !== 'editor') {
+        return reply.code(403).send({ error: 'forbidden' });
+      }
+    });
+
+    adminApp.get('/api/v1/admin/wiki/proposals', async (req) => {
+      const proposals = await prisma.wikiProposal.findMany({
+        where: { status: 'pending' },
+        include: { article: { select: { title: true, slug: true } }, suggestedBy: { select: { name: true, username: true } } },
+        orderBy: { createdAt: 'desc' },
+      });
+      return { proposals };
+    });
+
+    adminApp.patch('/api/v1/admin/wiki/proposals/:id', async (req, reply) => {
+      const { id } = req.params as { id: string };
+      const parsed = reviewProposalSchema.safeParse(req.body);
+      if (!parsed.success) return reply.code(400).send({ error: 'invalid_input' });
+
+      const proposal = await prisma.wikiProposal.findUnique({ where: { id } });
+      if (!proposal) return reply.code(404).send({ error: 'not_found' });
+
+      const updated = await prisma.wikiProposal.update({
+        where: { id },
+        data: {
+          status: parsed.data.status,
+          rejectionReason: parsed.data.rejectionReason,
+          reviewedById: req.session!.userId,
+        },
+      });
+
+      if (parsed.data.status === 'approved') {
+        // Merge text and record in ArticleRevision
+        await prisma.articleRevision.create({
+          data: {
+            articleId: proposal.articleId,
+            savedById: req.session!.userId,
+            title: proposal.title,
+            summary: proposal.summary,
+            content: proposal.content,
+            status: 'wiki_merge',
+          },
+        });
+        
+        await prisma.article.update({
+          where: { id: proposal.articleId },
+          data: {
+            title: proposal.title,
+            summary: proposal.summary,
+            content: proposal.content,
+            dateModified: new Date(),
+          },
+        });
+      }
+
+      return { success: true, proposal: updated };
+    });
+  });
+};