Cathy Overton-Clapham (born Cathy Overton, July 19, 1969) nicknamed "Cathy O" is a Canadian curler. Overton-Clapham is one of Manitoba's most decorated female curlers, with one world championship, five national championships, and thirteen Scotties Tournament of Hearts appearances. In 2019, she began coaching Jamie Sinclair's team, and currently coaches the Cory Christensen team. In 2019, Overton-Clapham was named the fifth greatest Canadian curler in history in a TSN poll of broadcasters, reporters and top curlers. Career Overton-Clapham skipped Team Manitoba to a 1989 Canadian Junior Curling Championships win. This qualified her for the 1990 World Junior Curling Championships, during which she won a bronze medal for team Canada. Overton-Clapham had been to one other Canadian Junior Championship, having played third for Janet Harvey in 1986, finishing third. In 1991, Overton-Clapham made her first trip to the Scott Tournament of Hearts, Canada's national women's curling championship. She played third for Kathie Allardyce and the team finished with a 5–6 record. In 1995, she returned to the Tournament of Hearts, this time as third for Connie Laliberte. The team won the Hearts that year, and went on to win the silver medal at the 1995 Ford World Curling Championships, losing to Sweden's Elisabet Gustafson in the final. Overton-Clapham would also play at the 1996, 1999, and 2000 Hearts for Laliberte, finishing third each time. Starting the 1999–2000 season, Overton-Clapham would begin throwing fourth stones for Laliberte. When Laliberte became pregnant, Overton-Clapham would take over as skip of the team. Now, skipping the squad, Jill Staub, was brought in at third, Debbie Jones-Walker and Janet Arnott remained at second and lead. Overton-Clapham would skip the team to victory winning the Manitoba Provincials. With Laliberte rejoining the squad for Nationals, Overton-Clapham would move back to throwing fourth stones, with Laliberte calling the game, and Staub moving to fifth. They would finish third at the 2000 Scott Tournament of Hearts losing the semi-final to British Columbia's Kelley Law. Jones partnership success Overton-Clapham would again return to the Hearts in 2005, but as a third for Jennifer Jones. There at the 2005 Scott Tournament of Hearts, the team won the championship, defeating Jenn Hanna of Ontario in the final. The team would go on to finish fourth at the 2005 World Women's Curling Championship. Together the team would participate in the 2005 Canadian Olympic Curling Trials, but would finish 5-4 failing to reach the playoffs. The