diff --git a/src/plugins/git/demoData/example-git.json b/src/plugins/git/demoData/example-git.json
index 0918e93..b75424f 100644
--- a/src/plugins/git/demoData/example-git.json
+++ b/src/plugins/git/demoData/example-git.json
@@ -5,6 +5,9 @@
             "parentHashes": [
                 "69c5aad50eec8f2a0a07c988c3b283a6490eb45b"
             ],
+            "submoduleUrls": {
+                "pygravitydefier": "https://github.com/sourcecred/example-git-submodule.git"
+            },
             "treeHash": "7be3ecfee5314ffa9b2d93fc4377792b2d6d70ed"
         },
         "69c5aad50eec8f2a0a07c988c3b283a6490eb45b": {
@@ -12,6 +15,9 @@
             "parentHashes": [
                 "e8b7a8f19701cd5a25e4a097d513ead60e5f8bcc"
             ],
+            "submoduleUrls": {
+                "pygravitydefier": "https://github.com/sourcecred/example-git-submodule.git"
+            },
             "treeHash": "bbf3b8b3d26a4f884b5c022d46851f593d329192"
         },
         "8d287c3bfbf8455ef30187bf5153ffc1b6eef268": {
@@ -19,6 +25,9 @@
             "parentHashes": [
                 "c08ee3a4edea384d5291ffcbf06724a13ed72325"
             ],
+            "submoduleUrls": {
+                "pygravitydefier": "https://github.com/sourcecred/example-git-submodule.git"
+            },
             "treeHash": "3dfb84795e07341b05fad3a0d5a55f8304b2d7d8"
         },
         "c08ee3a4edea384d5291ffcbf06724a13ed72325": {
@@ -26,12 +35,16 @@
             "parentHashes": [
                 "c2b51945e7457546912a8ce158ed9d294558d294"
             ],
+            "submoduleUrls": {
+            },
             "treeHash": "2f7155e359fd0ecb96ffdca66fa45b6ed5792809"
         },
         "c2b51945e7457546912a8ce158ed9d294558d294": {
             "hash": "c2b51945e7457546912a8ce158ed9d294558d294",
             "parentHashes": [
             ],
+            "submoduleUrls": {
+            },
             "treeHash": "bdff5d94193170015d6cbb549b7b630649428b1f"
         },
         "d160cca97611e9dfed642522ad44408d0292e8ea": {
@@ -39,6 +52,9 @@
             "parentHashes": [
                 "8d287c3bfbf8455ef30187bf5153ffc1b6eef268"
             ],
+            "submoduleUrls": {
+                "pygravitydefier": "https://github.com/sourcecred/example-git-submodule.git"
+            },
             "treeHash": "569e1d383759903134df75230d63c0090196d4cb"
         },
         "e8b7a8f19701cd5a25e4a097d513ead60e5f8bcc": {
@@ -46,6 +62,9 @@
             "parentHashes": [
                 "d160cca97611e9dfed642522ad44408d0292e8ea"
             ],
+            "submoduleUrls": {
+                "pygravitydefier": "https://github.com/sourcecred/example-git-submodule.git"
+            },
             "treeHash": "819fc546cea489476ce8dc90785e9ba7753d0a8f"
         }
     },
diff --git a/src/plugins/git/loadRepository.js b/src/plugins/git/loadRepository.js
index b62d211..c69ef5c 100644
--- a/src/plugins/git/loadRepository.js
+++ b/src/plugins/git/loadRepository.js
@@ -43,10 +43,85 @@ function findCommits(git: GitDriver, rootRef: string): Commit[] {
     .filter((line) => line.length > 0)
     .map((line) => {
       const [hash, treeHash, ...parentHashes] = line.trim().split(" ");
-      return {hash, parentHashes, treeHash};
+      const submoduleUrls = loadSubmoduleUrls(git, hash);
+      return {hash, parentHashes, treeHash, submoduleUrls};
     });
 }
 
+const GITMODULES_SUBMODULES_KEY_RE = /^submodule\.(.*)\.(path|url)$/;
+
+function loadSubmoduleUrls(
+  git: GitDriver,
+  commitHash: Hash
+): {[path: string]: string} {
+  const gitmodulesRef = `${commitHash}:.gitmodules`;
+  const gitmodulesBlob: string | null = (() => {
+    try {
+      return git(["rev-parse", "--quiet", "--verify", gitmodulesRef]).trim();
+    } catch (e) {
+      if (e.status === 1) {
+        // No .gitmodules file here.
+        return null;
+      } else {
+        throw e;
+      }
+    }
+  })();
+  if (gitmodulesBlob == null) {
+    // No problem; there just weren't any submodules at this commit.
+    return {};
+  }
+
+  // The output format of the following is `${key}\n${value}\0...`, as
+  // specified in `git help config`'s section about the `-z` option.
+  // The format is safe because keys are strictly validated; see the
+  // function `git_config_parse_key` in `git/git:config.c`.
+  const rawConfig = git(["config", "--blob", gitmodulesBlob, "--list", "-z"]);
+  const configKeyValuePairs = rawConfig
+    .split("\0")
+    .filter((line) => line.length > 0)
+    .map((line) => {
+      const separator = line.indexOf("\n");
+      if (separator < 0) {
+        // Shouldn't happen, according to Git docs. Guard anyway.
+        throw new Error(`Bad .gitmodules line at ${commitHash}: ${line}`);
+      }
+      return {
+        key: line.substring(0, separator),
+        value: line.substring(separator + 1),
+      };
+    });
+
+  const submoduleInfoByKey: {
+    [submoduleKey: string]: {path: string | null, url: string | null},
+  } = {};
+  configKeyValuePairs.forEach(({key, value}) => {
+    const match = key.match(GITMODULES_SUBMODULES_KEY_RE);
+    if (!match) {
+      return;
+    }
+    const [_, submoduleKey, kind] = match;
+    if (submoduleInfoByKey[submoduleKey] == null) {
+      submoduleInfoByKey[submoduleKey] = {path: null, url: null};
+    }
+    if (kind !== "path" && kind !== "url") {
+      throw new Error(`Invariant violation: bad kind: ${kind}`);
+    }
+    submoduleInfoByKey[submoduleKey][kind] = value;
+  });
+
+  const result = {};
+  Object.keys(submoduleInfoByKey).forEach((submoduleKey) => {
+    const {path, url} = submoduleInfoByKey[submoduleKey];
+    if (path != null && url != null) {
+      result[path] = url;
+    } else {
+      console.warn(`Partial submodule at ${commitHash}: ${submoduleKey}`);
+    }
+  });
+  return result;
+}
+
 function findTrees(git: GitDriver, rootTrees: Set<Hash>): Tree[] {
   const result: Tree[] = [];
   const visited: Set<Hash> = new Set();
diff --git a/src/plugins/git/types.js b/src/plugins/git/types.js
index c10d19d..ee3c140 100644
--- a/src/plugins/git/types.js
+++ b/src/plugins/git/types.js
@@ -12,6 +12,7 @@ export type Commit = {|
   +hash: Hash,
   +parentHashes: $ReadOnlyArray<Hash>,
   +treeHash: Hash,
+  +submoduleUrls: {[path: string]: string},
 |};
 export type Tree = {|
   +hash: Hash,