diff --git a/mysql-test/main/vector_innodb.result b/mysql-test/main/vector_innodb.result
index 5a20d3f4c54db..9cc79dcf011ff 100644
--- a/mysql-test/main/vector_innodb.result
+++ b/mysql-test/main/vector_innodb.result
@@ -376,3 +376,18 @@ Warning	1292	Incorrect vector value: '1' for column `test`.`t1`.`v` at row 1
 drop table t1;
 set sql_mode=default;
 # End of 11.8 tests
+# MDEV-35821: vector index sizes are not in information_schema.TABLES nor SHOW TABLE STATUS
+CREATE TABLE t_vec (
+id INT PRIMARY KEY,
+v VECTOR(4) NOT NULL,
+VECTOR INDEX (v)
+) ENGINE=InnoDB;
+INSERT INTO t_vec VALUES (1, VEC_FromText('[1,2,3,4]'));
+INSERT INTO t_vec VALUES (2, VEC_FromText('[2,3,4,5]'));
+SELECT index_length > 0 AS index_length_is_nonzero
+FROM information_schema.TABLES
+WHERE table_schema = 'test' AND table_name = 't_vec';
+index_length_is_nonzero
+1
+DROP TABLE t_vec;
+# End of 11.9 tests
diff --git a/mysql-test/main/vector_innodb.test b/mysql-test/main/vector_innodb.test
index efc272798f3b1..71cb97ae15563 100644
--- a/mysql-test/main/vector_innodb.test
+++ b/mysql-test/main/vector_innodb.test
@@ -370,3 +370,22 @@ drop table t1;
 set sql_mode=default;
 
 --echo # End of 11.8 tests
+
+--echo # MDEV-35821: vector index sizes are not in information_schema.TABLES nor SHOW TABLE STATUS
+
+CREATE TABLE t_vec (
+  id INT PRIMARY KEY,
+  v VECTOR(4) NOT NULL,
+  VECTOR INDEX (v)
+) ENGINE=InnoDB;
+
+INSERT INTO t_vec VALUES (1, VEC_FromText('[1,2,3,4]'));
+INSERT INTO t_vec VALUES (2, VEC_FromText('[2,3,4,5]'));
+
+SELECT index_length > 0 AS index_length_is_nonzero
+FROM information_schema.TABLES
+WHERE table_schema = 'test' AND table_name = 't_vec';
+
+DROP TABLE t_vec;
+
+--echo # End of 11.9 tests
diff --git a/storage/innobase/handler/ha_innodb.cc b/storage/innobase/handler/ha_innodb.cc
index 21dbe9ce1910d..248140f9465cb 100644
--- a/storage/innobase/handler/ha_innodb.cc
+++ b/storage/innobase/handler/ha_innodb.cc
@@ -14917,6 +14917,25 @@ ha_innobase::info_low(
 			stats.index_file_length
 				= ulonglong(stat_sum_of_other_index_sizes)
 				* size;
+            /* Include hlindex (vector index) size in index_file_length */
+            if (table->s->hlindexes())
+            {
+                char hli_name[FN_REFLEN];
+                char norm_path[FN_REFLEN];
+                normalize_table_name(norm_path, sizeof(norm_path),
+                        table->s->normalized_path.str);
+                my_snprintf(hli_name, sizeof(hli_name),
+                        "%s" HLINDEX_TEMPLATE,
+                        norm_path, table->s->keys);
+                if (dict_table_t *hli_table= dict_table_open_on_name(hli_name, false,
+                            DICT_ERR_IGNORE_NONE))
+                {
+                    if (fil_space_t *hli_space= hli_table->space)
+                        stats.index_file_length+=
+                            ulonglong(hli_space->size) * hli_space->physical_size();
+                    dict_table_close(hli_table, m_user_thd, nullptr);
+                }
+            }
 			if (flag & HA_STATUS_VARIABLE_EXTRA) {
 				space->s_lock();
 				stats.delete_length = 1024