Catherine Ann "Cathy" Hearn-Röthenmund (born June 1, 1958) competed for the United States in the K1 Women's category from the late 1970s to the early 2000s (decade).

She won ten medals at the ICF Canoe Slalom World Championships with two golds (K-1: 1979, K-1 team: 1979), three silvers (K-1: 1981, K-1 team: 1989 and 1993), and five bronzes (K-1: 1989, 1997, K-1 team: 1977, 1981, 1987).

Hearn also competed in two Sumer Olympics, earning her best finish of seventh at the 1996 Atlanta Olympic Games.

Her brother, David, and her ex-husband, Lecky Haller, also competed for the U.S. in Canoe Slalom. Her brother-in-law is a former Swiss kayaker Mathias Rothenmund.

From 2005 to 2010, Hearn served as a coach for the U.S. Canoe Slalom National Team.