"What Is This Thing Called Love?" is a song written by Jimmy Jam and Terry Lewis and recorded by American recording artist Alexander O'Neal. It is the second single from the singer's fourth solo album, All True Man (1991). The song's distinctive backing vocals were performed by Lisa Keith. Following the successful chart performances of the All True Man single "All True Man", "What Is This Thing Called Love?" was released as the album's second single.

Alexander O'Neal's 19th hit single and it reached #53 in the UK Singles Chart. In the United States, the single reached #21 on Billboard's Hot R&B/Hip-Hop Singles & Tracks.

Credits are adapted from the album's liner notes.

...
Wikipedia