Ahmanson may refer to:
People with the surname Caroline Leonetti Ahmanson (1918–2005), American fashion consultant, businesswoman and philanthropist Howard Ahmanson, Jr. (born 1950), American philanthropist and writer Howard F. Ahmanson, Sr. (1906–1968), American businessman and philanthropist Robert H. Ahmanson (circa 1937–2007), American businessman and philanthropist William H. Ahmanson (1925-2008), American chief executive, philatelist and philanthropist
Places Ahmanson Ranch, now known as the Upper Las Virgenes Canyon Open Space Preserve Ahmanson Theatre, theatre in Los Angeles, California
Other H. F. Ahmanson & Co., defunct American financial services company Ahmanson's sportive lemur, a lemur from Madagascar