"This Guy's in Love with You" is a hit song written by Burt Bacharach and Hal David and released by Herb Alpert in May, 1968.

Although known primarily for his trumpet playing as the leader of the Tijuana Brass, Alpert sang lead vocals on this solo recording, which was arranged by Bacharach.

These artists included Dionne Warwick, Dusty Springfield, Aretha Franklin, Petula Clark, Ella Fitzgerald, Connie Francis, and Diana Ross & The Supremes.

Alpert, quoted in Bacharach's 2013 memoir Anyone Who Had a Heart, had a different recollection of the original title from Hal David.

The composition had a recognizable Bacharach-David feel, a spot for a signature horn solo in the bridge and in the fadeout, and it was an easy song to sing for singers like Alpert with a limited vocal range.

Alpert's filmed version of "This Guy's in Love with You" appeared on April 22, 1968 as a part of his CBS television special The Beat of the Brass.

In response to numerous viewer telephone calls to the network following the broadcast, Alpert decided that the song should be released as a single recording.

Billboard Hot 100 pop singles chart in June of that year, remaining in the top position for four weeks.

Nancy Sinatra debuted the female-protagonist version of the lyrics ("This Girl's in Love with You") live on The Ed Sullivan Show on May 26, 1968.

Eydie Gormé's recording, first released as a single in July, 1968, reached number 22 on the U.S. Easy Listening chart in the summer of 1968.

Guitarist Tony Mottola also reached number 22 on the U.S. Easy Listening chart in the summer of 1968 with his instrumental version of the song.

[29] On 29 June 1996 at the London Festival Hall, Noel Gallagher of Oasis sang a version of the song with Bacharach playing piano; the following weekend it was aired on BBC Radio 2.

Mac DeMarco covered the song in 2014, which served as an "introduction" to his touring band's new guitarist, Andy White of Tonstartssbandht.