Pilar Shimizu (born May 27, 1996 in Tamuning, Guam) is a Guamanian breaststroke swimmer. While qualifying for the 2012 Summer Olympics she broke the 20-year-old national record set by Tammie Kaae, another Olympian from Guam. At these Olympics she became the youngest Olympian ever from Guam at age 16. She finished 42nd in the 100 meter breaststroke event and did not advance to the semifinals. Shimizu also competed in the 2016 Summer Olympics. Internationally, Shimizu has earned three bronze medals at the Oceania Games and two silver medals at the Pacific Games.