 <p>For MySQL 5.7:</p> <pre><code>ALTER TABLE tbl_name RENAME INDEX old_index_name TO new_index_name </code></pre> <p>For MySQL older versions:</p> <pre><code>ALTER TABLE tbl_name DROP INDEX old_index_name, ADD INDEX new_index_name (...) </code></pre> <p>See <a href="http://dev.mysql.com/doc/refman/5.7/en/alter-table.html">http://dev.mysql.com/doc/refman/5.7/en/alter-table.html</a></p>