Alum Rock may refer to:
Alum rock, a specific chemical compound and a class of chemical compounds Alum Rock (CDP), California, census-designated place in Santa Clara County Alum Rock, San Jose, a district of San Jose, California, located in East San Jose 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)