"I Just Don't Understand" is a song written by Marijohn Wilkin and Kent Westberry, released by Swedish-born singer and American citizen Ann-Margret. It charted at No. 17 on the US Billboard Hot 100 chart in 1961. It was one of the first records to feature a fuzz-tone guitar. It was later recorded by The Beatles on 16 July 1963 at the BBC Paris Studio, London for the Pop Go The Beatles radio show and appeared on their 1994 compilation album Live at the BBC, with lead vocals by John Lennon.