"World's Smallest Violin" is a song recorded by the American pop band AJR. It was released on March 26, 2021, as the 11th track from the band's fourth studio album OK Orchestra and as a music video. In 2022, the song became a viral song on the social media platform TikTok, with many using the ending verse and the line "I'll blow up into smithereens" as a soundbite on the site as fan edits or by throwing back to viral videos.

AJR is an American indie pop band founded by brothers Adam, Jack, and Ryan Met, collectively a trio of vocalists, multi-instrumentalists, and songwriters. The brothers grew up in New York City, primarily focused on busking and singing covers until releasing their first album, Living Room, on March 3, 2015. As of 2024, they have produced and released five studio albums under the independent label AJR Productions to various record labels.