"When I Said I Do" is a song written by American country music singer Clint Black, and recorded by Black and his wife Lisa Hartman Black as a duet. It was released in August 1999 as the first single from Black's album D'lectrified. The song reached the top of the U.S. Billboard Hot Country Singles & Tracks chart and the Canadian RPM Country Tracks chart. It also peaked at number 31 on the U.S. Billboard Hot 100. It is one of only two chart singles for Lisa Hartman Black. The song was later covered by then-husband and wife Kenny Lattimore and Chanté Moore on their album Things That Lovers Do.