Roxanne Vincenta Modafferi (born September 24, 1982) is an American retired mixed martial artist, who most recently fought for the UFC.

Kristen Deborah Modafferi (born June 1, 1979; disappeared June 23, 1997) is an American woman who, at the age of 18, in the early summer of 1997, disappeared in mysterious circumstances after leaving her work at the Crocker Galleria Mall in San Francisco, California.