"This Guy's in Love with You" is a song written by Burt Bacharach and Hal David and recorded by Herb Alpert. Although known primarily for his trumpet playing as the leader of the Tijuana Brass, Alpert sang lead vocals on this solo recording, arranged by Bacharach.

Alpert originally sang "This Guy's in Love with You" on a 1968 television special, The Beat of the Brass. In response to numerous viewer telephone calls, the song was released as a single and reached #1 on the U.S. Billboard Hot 100 in June of that year, remaining in the top position for four weeks. It was not only Alpert's first #1 single, but it was also the first #1 single for his A&M record label. The song also spent ten weeks at #1 on the Easy Listening chart. For the single's B-side, Alpert chose "A Quiet Tear," an album track from his first album in 1962, The Lonely Bull.
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You see this guy, this guy's in love with you
Yes I'm in love who looks at you the way I do
When you smile I can tell it know each other very well

How can I show you I'm glad I got to know you 'cause
I've heard some talk they say you think I'm fine
This guy's in love and what I'd do to make you mine
Tell me now is it so don't let me be the last to know

My hands are shakin' don't let my heart keep breaking 'cause
I need your love, I want your love
Say you're in love and you'll be my guy, if not I'll just die

Tell me now is it so don't let me be the last to know
My hands are shakin' don't let my heart keep breaking 'cause
I need your love, I want your love
Say you're in love and you'll be my girl, if not I'll just die