diff --git a/Documentation/technical/api-path-walk.txt b/Documentation/technical/api-path-walk.txt
index 5fea1d1db17735..c51f92cd6495a4 100644
--- a/Documentation/technical/api-path-walk.txt
+++ b/Documentation/technical/api-path-walk.txt
@@ -57,6 +57,14 @@ commits are emitted.
 While it is possible to walk only commits in this way, consumers would be
 better off using the revision walk API instead.
 
+`prune_all_uninteresting`::
+	By default, all reachable paths are emitted by the path-walk API.
+	This option allows consumers to declare that they are not
+	interested in paths where all included objects are marked with the
+	`UNINTERESTING` flag. This requires using the `boundary` option in
+	the revision walk so that the walk emits commits marked with the
+	`UNINTERESTING` flag.
+
 Examples
 --------
 
diff --git a/path-walk.c b/path-walk.c
index 7715f0f8e41435..aaa2cce7471941 100644
--- a/path-walk.c
+++ b/path-walk.c
@@ -22,6 +22,7 @@ struct type_and_oid_list
 {
 	enum object_type type;
 	struct oid_array oids;
+	int maybe_interesting;
 };
 
 #define TYPE_AND_OID_LIST_INIT { \
@@ -124,6 +125,8 @@ static int add_children(struct path_walk_context *ctx,
 			strmap_put(&ctx->paths_to_lists, path.buf, list);
 			string_list_append(&ctx->path_stack, path.buf);
 		}
+		if (!(o->flags & UNINTERESTING))
+			list->maybe_interesting = 1;
 		oid_array_append(&list->oids, &entry.oid);
 	}
 
@@ -145,6 +148,40 @@ static int walk_path(struct path_walk_context *ctx,
 
 	list = strmap_get(&ctx->paths_to_lists, path);
 
+	if (ctx->info->prune_all_uninteresting) {
+		/*
+		 * This is true if all objects were UNINTERESTING
+		 * when added to the list.
+		 */
+		if (!list->maybe_interesting)
+			return 0;
+
+		/*
+		 * But it's still possible that the objects were set
+		 * as UNINTERESTING after being added. Do a quick check.
+		 */
+		list->maybe_interesting = 0;
+		for (size_t i = 0;
+		     !list->maybe_interesting && i < list->oids.nr;
+		     i++) {
+			if (list->type == OBJ_TREE) {
+				struct tree *t = lookup_tree(ctx->repo,
+							     &list->oids.oid[i]);
+				if (t && !(t->object.flags & UNINTERESTING))
+					list->maybe_interesting = 1;
+			} else {
+				struct blob *b = lookup_blob(ctx->repo,
+							     &list->oids.oid[i]);
+				if (b && !(b->object.flags & UNINTERESTING))
+					list->maybe_interesting = 1;
+			}
+		}
+
+		/* We have confirmed that all objects are UNINTERESTING. */
+		if (!list->maybe_interesting)
+			return 0;
+	}
+
 	/* Evaluate function pointer on this data, if requested. */
 	if ((list->type == OBJ_TREE && ctx->info->trees) ||
 	    (list->type == OBJ_BLOB && ctx->info->blobs))
@@ -187,7 +224,7 @@ static void clear_strmap(struct strmap *map)
 int walk_objects_by_path(struct path_walk_info *info)
 {
 	const char *root_path = "";
-	int ret = 0;
+	int ret = 0, has_uninteresting = 0;
 	size_t commits_nr = 0, paths_nr = 0;
 	struct commit *c;
 	struct type_and_oid_list *root_tree_list;
@@ -199,6 +236,7 @@ int walk_objects_by_path(struct path_walk_info *info)
 		.path_stack = STRING_LIST_INIT_DUP,
 		.paths_to_lists = STRMAP_INIT
 	};
+	struct oidset root_tree_set = OIDSET_INIT;
 
 	trace2_region_enter("path-walk", "commit-walk", info->revs->repo);
 
@@ -211,6 +249,7 @@ int walk_objects_by_path(struct path_walk_info *info)
 	/* Insert a single list for the root tree into the paths. */
 	CALLOC_ARRAY(root_tree_list, 1);
 	root_tree_list->type = OBJ_TREE;
+	root_tree_list->maybe_interesting = 1;
 	strmap_put(&ctx.paths_to_lists, root_path, root_tree_list);
 
 	/*
@@ -301,10 +340,17 @@ int walk_objects_by_path(struct path_walk_info *info)
 		oid = get_commit_tree_oid(c);
 		t = lookup_tree(info->revs->repo, oid);
 
-		if (t)
+		if (t) {
+			oidset_insert(&root_tree_set, oid);
 			oid_array_append(&root_tree_list->oids, oid);
-		else
+		} else {
 			warning("could not find tree %s", oid_to_hex(oid));
+		}
+
+		if (t && (c->object.flags & UNINTERESTING)) {
+			t->object.flags |= UNINTERESTING;
+			has_uninteresting = 1;
+		}
 	}
 
 	trace2_data_intmax("path-walk", ctx.repo, "commits", commits_nr);
@@ -317,6 +363,21 @@ int walk_objects_by_path(struct path_walk_info *info)
 	oid_array_clear(&commit_list->oids);
 	free(commit_list);
 
+	/*
+	 * Before performing a DFS of our paths and emitting them as interesting,
+	 * do a full walk of the trees to distribute the UNINTERESTING bit. Use
+	 * the sparse algorithm if prune_all_uninteresting was set.
+	 */
+	if (has_uninteresting) {
+		trace2_region_enter("path-walk", "uninteresting-walk", info->revs->repo);
+		if (info->prune_all_uninteresting)
+			mark_trees_uninteresting_sparse(ctx.repo, &root_tree_set);
+		else
+			mark_trees_uninteresting_dense(ctx.repo, &root_tree_set);
+		trace2_region_leave("path-walk", "uninteresting-walk", info->revs->repo);
+	}
+	oidset_clear(&root_tree_set);
+
 	string_list_append(&ctx.path_stack, root_path);
 
 	trace2_region_enter("path-walk", "path-walk", info->revs->repo);
diff --git a/path-walk.h b/path-walk.h
index 3f3b63180efda7..3e44c4b8a588e9 100644
--- a/path-walk.h
+++ b/path-walk.h
@@ -38,6 +38,14 @@ struct path_walk_info {
 	int trees;
 	int blobs;
 	int tags;
+
+	/**
+	 * When 'prune_all_uninteresting' is set and a path has all objects
+	 * marked as UNINTERESTING, then the path-walk will not visit those
+	 * objects. It will not call path_fn on those objects and will not
+	 * walk the children of such trees.
+	 */
+	int prune_all_uninteresting;
 };
 
 #define PATH_WALK_INFO_INIT {   \
diff --git a/t/helper/test-path-walk.c b/t/helper/test-path-walk.c
index 69a4361f6de43b..fa3bfe46b5de1c 100644
--- a/t/helper/test-path-walk.c
+++ b/t/helper/test-path-walk.c
@@ -55,8 +55,12 @@ static int emit_block(const char *path, struct oid_array *oids,
 		BUG("we do not understand this type");
 	}
 
-	for (size_t i = 0; i < oids->nr; i++)
-		printf("%s:%s:%s\n", typestr, path, oid_to_hex(&oids->oid[i]));
+	for (size_t i = 0; i < oids->nr; i++) {
+		struct object *o = lookup_unknown_object(the_repository,
+							 &oids->oid[i]);
+		printf("%s:%s:%s%s\n", typestr, path, oid_to_hex(&oids->oid[i]),
+		       o->flags & UNINTERESTING ? ":UNINTERESTING" : "");
+	}
 
 	return 0;
 }
@@ -76,6 +80,8 @@ int cmd__path_walk(int argc, const char **argv)
 			 N_("toggle inclusion of tag objects")),
 		OPT_BOOL(0, "trees", &info.trees,
 			 N_("toggle inclusion of tree objects")),
+		OPT_BOOL(0, "prune", &info.prune_all_uninteresting,
+			 N_("toggle pruning of uninteresting paths")),
 		OPT_END(),
 	};
 
diff --git a/t/t6601-path-walk.sh b/t/t6601-path-walk.sh
index f4cdc9c8d361e3..26498cab24890d 100755
--- a/t/t6601-path-walk.sh
+++ b/t/t6601-path-walk.sh
@@ -229,19 +229,19 @@ test_expect_success 'topic, not base, boundary' '
 
 	cat >expect <<-EOF &&
 	COMMIT::$(git rev-parse topic)
-	COMMIT::$(git rev-parse base~1)
+	COMMIT::$(git rev-parse base~1):UNINTERESTING
 	commits:2
 	TREE::$(git rev-parse topic^{tree})
-	TREE::$(git rev-parse base~1^{tree})
-	TREE:left/:$(git rev-parse base~1:left)
+	TREE::$(git rev-parse base~1^{tree}):UNINTERESTING
+	TREE:left/:$(git rev-parse base~1:left):UNINTERESTING
 	TREE:right/:$(git rev-parse topic:right)
-	TREE:right/:$(git rev-parse base~1:right)
+	TREE:right/:$(git rev-parse base~1:right):UNINTERESTING
 	trees:5
-	BLOB:a:$(git rev-parse base~1:a)
-	BLOB:left/b:$(git rev-parse base~1:left/b)
-	BLOB:right/c:$(git rev-parse base~1:right/c)
+	BLOB:a:$(git rev-parse base~1:a):UNINTERESTING
+	BLOB:left/b:$(git rev-parse base~1:left/b):UNINTERESTING
+	BLOB:right/c:$(git rev-parse base~1:right/c):UNINTERESTING
 	BLOB:right/c:$(git rev-parse topic:right/c)
-	BLOB:right/d:$(git rev-parse base~1:right/d)
+	BLOB:right/d:$(git rev-parse base~1:right/d):UNINTERESTING
 	blobs:5
 	tags:0
 	EOF
@@ -252,4 +252,28 @@ test_expect_success 'topic, not base, boundary' '
 	test_cmp expect.sorted out.sorted
 '
 
+test_expect_success 'topic, not base, boundary with pruning' '
+	test-tool path-walk --prune -- --boundary topic --not base >out &&
+
+	cat >expect <<-EOF &&
+	COMMIT::$(git rev-parse topic)
+	COMMIT::$(git rev-parse base~1):UNINTERESTING
+	commits:2
+	TREE::$(git rev-parse topic^{tree})
+	TREE::$(git rev-parse base~1^{tree}):UNINTERESTING
+	TREE:right/:$(git rev-parse topic:right)
+	TREE:right/:$(git rev-parse base~1:right):UNINTERESTING
+	trees:4
+	BLOB:right/c:$(git rev-parse base~1:right/c):UNINTERESTING
+	BLOB:right/c:$(git rev-parse topic:right/c)
+	blobs:2
+	tags:0
+	EOF
+
+	sort expect >expect.sorted &&
+	sort out >out.sorted &&
+
+	test_cmp expect.sorted out.sorted
+'
+
 test_done