"Jennifer Juniper" is a song and single by the British singer-songwriter, Donovan, released in 1968. It peaked at number 5 in the UK Singles Chart, and at number 26 in the Billboard Hot 100.AllMusic journalist, Matthew Greenwald, noted that "capturing all of the innocence of the era perfectly, it's one of his finest singles".

The track was written about Jenny Boyd, sister of Pattie Boyd, while they were all with The Beatles in Rishikesh. She married Mick Fleetwood and was, at one time, the sister-in-law of George Harrison and, later, Eric Clapton. The song features a wind section with oboe, flute, and bassoon. The last stanza of the song is sung in French.

Donovan also performed on a novelty cover of the single released in Britain in 1990, by comedy duo Trevor and Simon, as 'The Singing Corner Meets Donovan'. It spent one week at number 68 in the UK Singles Chart in December 1990.

The B-side "Poor Cow" is a song produced for the film Poor Cow by Ken Loach. The original title of the song was "Poor Love". The title was changed when the song appeared in the film. It retained that title when released as the B-side to "Jennifer Juniper" in February 1968. "Poor Cow" is introduced by Donovan as "Poor Love" on his live album Donovan in Concert (1968).

The song features in The Simpsons episode "Flaming Moe", along with a character called Miss Juniper.

Theodore Bikel covered the song on his album A New Day (1970).

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