Lyle W. Hillyard (born September 25, 1940) is a Utah politician and an attorney. A Republican, he was a member of the Utah State Senate, representing the state's 25th senate district in Cache and Rich Counties including the city of Logan. He served in the legislature from 1981 to 2020, first as a representative from 1981 to 1984, then as a senator from 1985 to 2020.