List of Famous people born in Ontario, United States of America

Landon Timothy Donovan is an American retired professional soccer player who is currently the manager, co-founder, and vice-president of soccer operations for USL Championship side San Diego Loyal SC.

Prince Semien Fielder is an American former professional baseball first baseman and designated hitter, who played in Major League Baseball (MLB) for the Milwaukee Brewers, Detroit Tigers, and Texas Rangers. He was selected in the first round of the 2002 Major League Baseball draft by the Brewers out of Eau Gallie High School in Melbourne, Florida, and spent the first seven years of his MLB career with the Brewers before signing with the Tigers, in January 2012. In November 2013, Fielder was traded to the Rangers, where he played the remainder of his career.

Michael Anthony Muñoz, is an American former professional football player who was an offensive tackle for 13 seasons with the Cincinnati Bengals of the National Football League (NFL). Muñoz is widely considered to be one of the greatest offensive linemen in NFL history. He was inducted into the Pro Football Hall of Fame in 1998.

Gilbert Espinosa Chávez, was an American prelate of the Roman Catholic Church who served as auxiliary bishop of the Diocese of San Diego, California.

Edwin Harold Smith was an American diver who competed at the 1928 and 1932 Summer Olympics. In 1928 he finished fourth in the 3 m springboard. Four years later he won the gold medal in the 10 m platform and a silver in the 3 m springboard. Domestically he won the AAU springboard titles in the 1 m in 1928 and 1930 and in the 3 m in 1930 and 1931. After the 1932 Olympics he became a professional show diver, and a diving coach at New York Athletic Club and Yale University. He also prepared the German diving team to the 1936 Summer Olympics. During World War II he served as a captain in the U.S. Navy, and after that worked as a pool manager at luxury hotels in Palm Springs and Santa Barbara.

Lloyd Henry "Bummy" Bumstead was an American cinematic art director and production designer. In a career that spanned nearly 70 years, Bumstead began as a draftsman in RKO Pictures' art department and later served as an art director or production designer on more than 90 feature films. He won Academy Awards for Best Art Direction for To Kill a Mockingbird (1962) and The Sting (1973). He was also nominated for Academy Awards for his work on Vertigo (1958) and Unforgiven (1992).