"Hide and Seek" is a song recorded by English singer Imogen Heap and released on 19 May 2005 as the first single from her second album Speak for Yourself. Written and produced by Heap, the a cappella folktronica ballad heavily uses the harmonizer and describes painfully losing someone due to a breakup or a divorce.

"Hide and Seek" first gained popularity after appearing in a scene in the final episode of the second season of the Fox television series The O.C. and in The Shooting, a Saturday Night Live parody of the scene. It gained renewed popularity after being featured in an episode of the Hulu television series Normal People in 2020. The song's bridge was notably sampled in American singer Jason Derulo's 2009 debut single "Whatcha Say", which topped the Billboard Hot 100 chart. "Hide and Seek" went on to sell over 647,000 copies in the United States, earning it a gold certification from the RIAA. It was also a critical success, and has been cited by several critics as Heap's best song.

Heap performed "Hide and Seek" during the 2017 benefit concert One Love Manchester and during her 2019 performance on NPR's Tiny Desk Concerts series. The song also appeared on NPR's 2018 list of The 200 Greatest Songs By 21st Century Women+.