Let Him Run Wild

1965 song by the Beach Boys

"Let Him Run Wild" is a song by the American rock band the Beach Boys from their 1965 album Summer Days (And Summer Nights!!). Written by Brian Wilson and Mike Love, it was issued as the B side to "California Girls".

"Let Him Run Wild" was one of the first songs that Brian Wilson wrote while under the influence of marijuana. According to Wilson, the song is "about a girl who was dating a guy who didn’t stay close to her. The guy singing wants the girl to let her boyfriend run around and eventually leave her so he can come in and get her. He wants a bad thing to happen so that it’ll turn into a good thing." Biographer Peter Ames Carlin suggested that the song was inspired by the extramarital affairs of Brian's father Murry.

A soulful ballad, the song is said to have been inspired by Burt Bacharach while also foreshadowing the relatively complex music dynamics of Pet Sounds several months later. MOJO wrote: "With key and tempo changes bolder and weirder than anything before, this was Brian's signpost to the psychedelic country up ahead." With production by Brian Wilson and engineering by Chuck Britz, A few weeks later, vocals were overdubbed at CBS Columbia Square with a final mix occurring on May 28. and "I sounded like a fairy," naming it his least favorite Beach Boys recording. This caused Brian Wilson to remake the song on Imagination.

Cash Box described it as an "interesting weeper which blends in generous portions of counterpoint and harmony." Record World called it a "full sounding number" that would get plays despite being a B side. George Harrison kept the record on his jukebox at the time. Among the band members, Carl and Dennis Wilson reflected on "Let Him Run Wild" as the point where they began to take notice of their eldest brother's true talents as a writer and arranger. Al Jardine expressed a similar sentiment, stating, "In terms of the musical direction Brian was going, I always thought that 'Let Him Run Wild' was the turning point, the beginning of that phase when things began to get more complicated."

An instrumental version is found on the 1968 Stack O Tracks compilation. The 1990–2001 reissue of Summer Days (And Summer Nights!!) includes among the bonus tracks a version of the song with alternate backing vocals. The 2007 compilation The Warmth of the Sun featured the first stereo mix of the song.