Lost in Yesterday

"Lost in Yesterday" is a song by Tame Impala, the musical project of the Australian multi-instrumentalist Kevin Parker. It was released through Modular Recordings on 8 January 2020, as the fourth single from the project's fourth studio album, The Slow Rush (2020). Parker wrote and produced it, and also performed all the instruments and vocals. With disco, dub, and funk elements, it predominantly contains a groovy bassline. Lyrically, the song deals with nostalgia and the passage of time, centering on Parker's complicated relationship with these topics.

The duo Terri Timely, composed of Ian Kibbey and Corey Creasey, directed the music video for "Lost in Yesterday", which was released on 30 January 2020. It has a single shot style and depicts Parker as a band's lead vocalist in a 1970s retro wedding. Tame Impala performed the song on Jimmy Kimmel Live! and included it in the set list of the Slow Rush Tour between 2020 and 2021.

The song was ranked fifth on the Australian Triple J Hottest 100 of 2020 poll, and was nominated for Song of the Year and Most Performed Alternate Work at the APRA Music Awards of 2021. Commercially, "Lost in Yesterday" reached middle-low positions on the main national charts of Australia, Ireland, Lithuania, Portugal, and the United Kingdom. It received certifications in Australia, New Zealand, the United Kingdom, and the United States.