Catherine Ann "Cathy" Hearn-Röthenmund (born June 1, 1958) is an American slalom kayaker who competed from the late 1970s to the early 2000s.

She won ten medals at the ICF Canoe Slalom World Championships with two golds (K1: 1979, K1 team: 1979), three silvers (K1: 1981, K1 team: 1989, 1993), and five bronzes (K1: 1989, 1997, K1 team: 1977, 1981, 1987).

Hearn also competed in two Summer Olympics, earning her best finish of seventh in the K1 event in Atlanta in 1996.

Her brother, David Hearn, and her ex-husband, Lecky Haller, also competed for the United States in canoe slalom. Her brother-in-law is a former Swiss kayaker Mathias Röthenmund.

As of 2009, Hearn serves as a coach for the United States canoe slalom team.

• ICF medalists for Olympic and World Championships - Part 2: rest of flatwater (now sprint) and remaining canoeing disciplines: 1936-2007.
• Evans, Hilary; Gjerde, Arild; Heijmans, Jeroen; Mallon, Bill; et al. "Cathy Hearn". Olympics at Sports-Reference.com. Sports Reference LLC. Archived from the original on 2020-04-18.
• USA Canoe-Kayak Staff Directory featuring Hearn. - accessed 13 October 2009.