The 30-year-old Hill is 1-1 since her return to the octagon, decisioning Ashley Yoder in her last fight at the TUF 25 Finale in July.
Ansaroff, 31, is the girlfriend of bantamweight champion Amanda Nunes. She submitted Jocelyn Jones-Lybarger at UFC Fight Night 103 in January, which snapped a two-fight losing skid.
UFC Fight Night 120 is scheduled for Nov. 11 at the Ted Constant Convocation Center in Norfolk, Virginia.
The card currently includes:
Anthony Pettis (20-6-0) vs Dustin Poirier (21-5-0)
Junior Albini (14-2-0) vs Andrei Arlovski (25-15-0)
Karl Roberson (5-0-0) vs. Darren Stewart (7-1-0, 1NC)
Cezar Ferreira (11-6-0) vs Nate Marquardt (35-18-2)
Diego Sanchez (27-10-0) vs Matt Brown (20-16-0)
Angela Hill (7-3-0) vs Nina Ansaroff (7-5-0)
More bouts are expected to be announced.