"Happy Jack" is a song by the British rock band The Who. It was released as a single in December 1966 in the UK, peaking at No. 3 in the charts. It was also their first top forty hit in the United States, where it was released in March 1967 and peaked at No. 24. It was included on the American version of their second album, Happy Jack, originally titled A Quick One in the UK. It peaked at No. 1 in Canada.
The song features Roger Daltrey on lead vocals with John Entwistle singing the first verse, making it one of the only songs composed by Pete Townshend to feature Entwistle on lead vocals. At the tail end of "Happy Jack", Townshend can be heard shouting "I saw you!", and it is said that he was noticing drummer Keith Moon trying to join in surreptitiously to add his voice to the recording, something the rest of the band disliked.
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