The Guess Who were a Canadian rock band formed in Winnipeg, Manitoba in 1965. The band found their greatest success in the late 1960s and early 1970s, under the leadership of singer/keyboardist Burton Cummings and guitarist Randy Bachman, with hit songs including "American Woman", "These Eyes", and "No Time".

During their most successful period, The Guess Who released eleven studio albums, all of which reached the charts in Canada and the United States. Their 1970 album American Woman reached no. 1 in Canada and no. 9 in the United States, while five other albums reached the top ten in Canada. The Guess Who charted fourteen Top 40 singles in the United States and more than thirty in Canada. In the early years before Canadian Content broadcast rules were enacted, unlike other Canadian acts who tended to downplay their nationality, the band made a name for itself by proudly celebrating that and became hailed for self-confidence.

The Guess Who officially broke up in 1975, although a nostalgia-oriented lineup organized by former bassist Jim Kale has toured and recorded under The Guess Who name since 1978, often performing without any original band members on stage. Bachman and Cummings have long been unhappy with the Kale-sanctioned version of the group, and have launched lawsuits over the use of the Guess Who name and repertoire. A 2024 legal manoeuvre by Cummings prevented the group from playing any Guess Who songs (in a live or studio setting) that Cummings wrote or co-wrote -- this includes all six of the group's US top 10 hits. The group consequently cancelled all of its scheduled appearances from April 2024 forward. Further legal developments are expected.