D. Irvin Couvillion (born 1934, in Louisiana) was a special trial judge of the United States Tax Court. He was appointed to that position by the Chief Judge on July 1, 1985.

Prior to his lengthy service on the Tax Court, Couvillion was engaged in tax litigation in Baton Rouge, Louisiana for a decade. Before entering private practice, he had been an Administrative Assistant to U.S. Representative Speedy O. Long, from Louisiana's Eighth District, from 1966-73.

Couvillion earned a B.S. in Accounting from Louisiana State University, 1956; a J.D. from Louisiana State University Law School, 1959; and an LL.M. in Taxation from Georgetown University Law Center, Washington, D.C., 1973.