Nancy Jane Ditz (born June 25, 1954, in San Jose, California) is a former American long-distance runner who is a United States national champion in the marathon.

[5] Nancy worked to promote the 2009 Los Angeles Marathon with fellow Olympians Rod Dixon and Ed Eyestone.

Ditz Mosbacher graduated from Stanford while competing as a diver and crew member, and did not begin running competitively until age 25.

From the 1988 Summer Olympics, Ditz Mosbacher has been a color commentator for NBC and CBS Sports through the early 2000s.

She has covered events such as the 1996 Olympic Marathon Trials, the 1988 and 1989 NCAA Track and Field Championships, and the 1994 Examiner Bay to Breakers earning her a spot in the 2019 Road Runners Club of America Hall of Fame Class.