"If You Gotta Go, Go Now" (sometimes subtitled "(Or Else You Got to Stay All Night)") is a song written by Bob Dylan in 1964. The first released version was as a single in the US by the UK group the Liverpool Five in July 1965, but this did not chart in the US despite receiving much airplay, particularly in the Pacific Northwest. Another British band, Manfred Mann, then issued the song as a single in September 1965 and had a number 2 hit. Fairport Convention also had a chart hit, with a French version, in 1969.

Manfred Mann were an English rock band, formed in London and active between 1962 and 1969. The group were named after their keyboardist Manfred Mann, who later led the successful 1970s group Manfred Mann's Earth Band. The band had two different lead vocalists, Paul Jones from 1962 to 1966 and Mike d'Abo from 1966 to 1969.