One of Us Must Know (Sooner or Later)

"One of Us Must Know (Sooner or Later)"
Single cover, including Dylan wearing sunglasses at a microphone
Dutch picture sleeve
Single by Bob Dylan
from the album Blonde on Blonde
B-side"Queen Jane Approximately"
ReleasedFebruary 14, 1966 (1966-02-14)
RecordedJanuary 25, 1966
StudioColumbia A, New York
Length4:55
LabelColumbia
Songwriter(s)Bob Dylan
Producer(s)Bob Johnston
Bob Dylan singles chronology
"Can You Please Crawl Out Your Window?"
(1965)
"One of Us Must Know (Sooner or Later)"
(1966)
"Rainy Day Women #12 & 35"
(1966)
Official audio
"One of Us Must Know (Sooner or Later)" on YouTube

"One of Us Must Know (Sooner or Later)" is a song by American singer-songwriter Bob Dylan, which was released as a single on February 14, 1966, and as the fourth track on his seventh studio album Blonde on Blonde in June of that year. The song was written by Dylan and produced by Bob Johnston. It is the narrator's account of a burned-out relationship. It was recorded at Columbia studio A in New York on January 25, 1966, with Dylan and other musicians developing the song through over twenty takes during the session.

As a single, it peaked at No. 33 in the UK Singles Chart, but only reached No. 119 on the US Billboard magazine's Bubbling Under the Hot 100 chart. Reviewers at the time of the single's release afforded it a largely negative reception, with Dylan's vocal performance a particular focus of disapproval. Later critical assessments have been more positive. The song was included on The Original Mono Recordings (2010) and alternate versions appeared on The Bootleg Series Vol. 12: The Cutting Edge 1965–1966 (2015).