Did You Know That There's a Tunnel Under Ocean Blvd is the ninth studio album by American singer-songwriter and record producer Lana Del Rey. Released on March 24, 2023, by Interscope and Polydor Records, the album features production by Del Rey, Mike Hermosa, Jack Antonoff, Drew Erickson, Zach Dawes, and Benji. It includes collaborations with Jon Batiste, Bleachers, Father John Misty, Tommy Genesis, SYML and Riopy.

The album received generally positive reviews from music critics, with most of them praising Del Rey's lyricism and some criticizing the production. It was ranked among the best albums of 2023 by various publications. Commercially, the album topped the record charts in eight countries and reached the top-five in over 20 countries, including the United States, where it peaked at number three on the US Billboard 200.

Two singles and one promotional single preceded the release of the album: the title track was released as the lead single on December 7, 2022, while "A&W" was released as the album's second on February 14, 2023. The release of the third single, "The Grants", followed one month later on March 14, 2023. The album was nominated for Album of the Year and Best Alternative Music Album at the 66th Annual Grammy Awards; the fourth single "Candy Necklace", released on October 6, 2023.