Patricia Hy-Boulais (born 22 August 1965) is a former tennis player. She turned professional on October 12, 1986. Early in her career she represented Hong Kong (since the beginning until the end of the 1987 season). She became a citizen of Canada in 1991. However, she represented Canada just since the beginning of the 1988 season. Her best performance at a Grand Slam came when she got to the quarter finals of the 1992 US Open, defeating Eva Švíglerová, Judith Wiesner, Jennifer Capriati and Helena Suková before losing to eventual champion Monica Seles.
After Hy-Boulais did it in 1992, Canada did not have another woman to survive into the second week at the French Open until Aleksandra Wozniak did it in 2009.
Hy-Boulais represented her new country at the 1996 Summer Olympics in Atlanta, Georgia, where she was eliminated in the second round by the number one seed Monica Seles. Hy-Boulais reached her highest ranking in the WTA Tour on March 8, 1993, when she became the number 28 of the world.
Hy-Boulais's daughter Isabelle is a top Canadian tennis prospect.