Alexander White Gregg (January 31, 1855 – April 30, 1919) was a Democratic member of the United States House of Representatives between 1903 and 1919.

Gregg was born in Centerville, Texas on January 31, 1855.

He attended King College in Bristol, Tennessee, graduating in 1874 and later studied law at the University of Virginia at Charlottesville.

He ran for Texas's 7th congressional district, and held a seat there between 1903 - 1919.

He did not run for re-election in 1918 and died a month after his term ended in Palestine, Texas, and is buried in East Hill Cemetery.