**William Abikoff** (born 1944) is an American mathematician. He is a professor of mathematics at the University of Connecticut since 1981.

Abikoff earned his Ph.D. in 1971 from Polytechnic University under the supervision of Georges Gustave Weill. In 2012, Abikoff became a Fellow of the American Mathematical Society.

"Augmented Teichmüller spaces". *Bull. Amer. Math. Soc*. **82**: 333–334. 1976. MR 0432919. doi:10.1090/s0002-9904-1976-14049-9.
"The Euler characteristic and inequalities for Kleinian groups". *Proc. Amer. Math. Soc*. **97**: 593–601. 1986. MR 845971. doi:10.1090/s0002-9939-1986-0845971-7.
with William J. Harvey: "Extremal Kleinian groups". *Proc. Amer. Math. Soc*. **140**: 267–278. 2012. MR 2833539. doi:10.1090/s0002-9939-2011-10923-7.
William Abikoff: The Real Analytic Theory of Teichmüller Space. AMS, Lecture note in mathematics, Springer-Verlag, 1980.