Alum Rock

Alum Rock may refer to:
 * Alum rock, a specific chemical compound and a class of chemical compounds
 * Alum Rock, California, US, formerly a town, now a neighborhood of San Jose, California
 * Alum Rock Park, in San Jose, California
 * Alum Rock, Pennsylvania
 * Alum Rock, Birmingham, an area in the UK, two miles east of Birmingham's city centre
 * Alum Rock (ward)