David Christian Farnsworth (born July 16, 1951)[2] is an American politician and a Republican member of the Arizona Senate representing District 10 since 2023.

He was previously appointed to the Arizona Senate on September 11, 2013, to fill the vacancy caused by the resignation of Rich Crandall.

[3] Farnsworth served non-consecutively in the Arizona State Legislature from January 1995 until January 1997 in the Arizona House of Representatives District 4 seat.

Farnsworth graduated from Mesa High School and earned his AA from Mesa Community College.