Kaiser Center, also called the Kaiser Building, is a 28-story office building located at 300 Lakeside Drive, adjacent to Lake Merritt, in downtown Oakland, California, designed by the architectural firm of Welton Becket & Associates of Los Angeles. The property is bounded by Lakeside Drive, which terminates and joins Harrison Street at the site, 20th-, 21st-, and Webster-streets. When completed in 1960, it was Oakland's tallest building, as well as the largest office tower west of the Rocky Mountains. A three-story office/retail building adjacent to the main tower was completed in 1963. Kaiser Center was the headquarters of Kaiser Industries, a Fortune 500 conglomerate that was headed by industrialist Edgar F. Kaiser at the time the building was constructed.

Welton David Becket was an American modern architect who designed many buildings in Los Angeles, California.