Abraham Phineas Nasatir (1903 – January 18, 1991) was an American educator and historian who specialized in early California and the Mississippi Valley areas.
Nasatir was born in Santa Ana, California, to Jewish parents who had immigrated from Lithuania.
After receiving his Ph.D., Nasatir taught Latin American History for one year at the University of Iowa.
Nasatir was the recipient of four Fulbright fellowships, and traveled to France, Spain and Chile for research.
In 1985 Nasatir's house was among those destroyed in the Normal Heights Fire, along with 500,000 documents and 2,500 books in his possession.