Terence Dwight Parsons (1939–2022)^[1] was an American philosopher, specializing in philosophy of language and metaphysics. He was emeritus professor of philosophy at UCLA.

Parsons was born in Endicott, New York and graduated from the University of Rochester with a BA in physics. He received his PhD from Stanford University in 1966. He was a full-time faculty member at the University of Illinois at Chicago from 1965 to 1972, at the University of Massachusetts at Amherst from 1972 to 1979, at the University of California at Irvine from 1979 to 2000, and at the University of California at Los Angeles from 2000 to 2012.^[2] In 2007, he was elected to the American Academy of Arts and Sciences.^[3]

Parsons worked on the semantics of natural language to develop theories of truth and meaning for natural language similar to those devised for artificial languages by philosophical logicians.^[4] Heavily influenced by Alexius Meinong, he wrote Nonexistent Objects (1980), which dealt with possible world theory in order to defend the reality of nonexistent objects.

• Nonexistent Objects, Yale University Press, 1980.
• Events in the Semantics of English, MIT Press, 1990.
• Indeterminate Identity, Oxford University Press, 2000.
• Articulating Medieval Logic, Oxford University Press, 2014.

• Round square copula