"Just When I Needed You Most" is the title of a 1979 song by the American singer-songwriter Randy VanWarmer. VanWarmer and, former Hot Chocolatemember Tony Wilson co-wrote the track, which was produced by Del Newman and appears on the singer's 1979 album, Warmer. It also appears on Tony Wilson's album "Catch One", produced in 1979 by Ron Albert and Howard Albert for Fat Albert Productions, Inc.

Released as a single in early 1979, "Just When I Needed You Most" spent two weeks atop the US Billboard adult contemporary chart in May of that year.^[1] In June, the song reached its peak position of #4 on the Billboard Hot 100 chart; it eventually stayed in the Top 40 for 14 weeks and was certified a Gold record by the RIAA.^[2] In addition, the song reached #71 on the Billboard country music chart.^[1] In September 1979, the song made the Top 10 on the UK Singles Chart, peaking at #8.^[3]

VanWarmer stated that he wrote the song after he had broken up with a girlfriend when he was 18 years old.^[1] The song was originally intended as the B-side to "Your Light", but record company executives preferred "Just When I Needed You Most" and made it the A-side of the single instead. VanWarmer believed that the "hook" which made the song stand out was an autoharp instrumental break between the second and third verses of the song, which was performed by musician John Sebastian.^[1]