"Is She Really Going Out with Him?" is a song by British musician Joe Jackson. It was released in September 1978 as his first single. The track, which was to achieve greater commercial success when reissued in 1979, was included on Jackson's debut album, Look Sharp!.

According to Joe Jackson, the song originated from when he heard the title. From there, he came up with the basis for the song lyrics of "pretty women" dating "gorillas." He said of the song's origins in an interview:

Now, that is just one of those songs that started with the title. I heard that phrase somewhere and I thought that could be a kind of funny song about gorgeous girls going out with monsters. It just started from there. It was just a funny song, or supposed to be funny. It was a great surprise to me when some people interpreted it as being angry.

Initially being released as a single in 1978, the song saw little chart success, failing to chart in both Britain and America. However, when the single was reissued in the summer of 1979 (catalogue number AMS 7459), the song saw greater success, reaching #13 in Britain and #21 in America. It also appeared in the charts in Australia, Canada and the Netherlands.

The UK B-side of the single, "You Got the Fever" was a non-album track that later appeared as a bonus track on later reissues of Look Sharp! In the U.S., however, "(Do the) Instant Mash," which also appeared on Look Sharp!, was issued as the B-side instead.

An alternate recording of the song was released as the B-side to Jackson's 1981 single, "Beat Crazy." The song was featured in the 1998 romantic comedy film, There's Something About Mary, The Simpsons episode "Rome-Old and Juli-Eh" and Live From Daryl's House episode No. 3 with the Plain White T's.

Live versions appeared on Live 1980/86 (containing three versions of the song including an acoustic version and an a cappella doo-wop version)", on Two Rainy Nights in 2002, and on the bonus CD of Volume 4 in 2003.

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