"Why Won't You Make Up Your Mind?" is a song by the Australian psychedelic rock band Tame Impala, released as a single in 2011. It was recorded during the sessions for the Innerspeaker album in 2009, and released as the fourth single from that album. The single features artwork from Australian artist Leif Podhajsky, who also created the artwork for Innerspeaker and the follow-up Lonerism.

"Why Won't You Make Up Your Mind?" was written by Kevin Parker in the key of F major in a 4/4 time signature. It is based around four repeating barre chords of A minor, B-flat major, E minor and F major, played on electric guitar, to create a trance-like, hypnotic and spacious atmosphere, while the bass is played rhythmically to fill in the guitar spaces.

It starts with three hi-hat hits on the drums, which was included by Parker as a tribute to the Outkast song Hey Ya! which starts with an uncommon three upbeats, rather than the more common four upbeats. Before the verse starts, a pitch-shifted, delayed, fuzz guitar kicks in, which many mistook for a synth, to play a melody in the F major scale, featuring stereo panning effects to give it a sense of movement.

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