Welty McCullogh (October 10, 1847 – August 31, 1889) was a Republican member of the U.S. House of Representatives from Pennsylvania.
He served as second clerk under Captain W. B. Coulter, provost marshal of twenty-first district of Pennsylvania, during the American Civil War.
He studied law, was admitted to the bar in 1872 and commenced practice in Greensburg.
He served as assistant solicitor for the Baltimore and Ohio Railroad.
McCullogh was elected as a Republican to the Fiftieth Congress.