Thinking of You (Katy Perry song)

"Thinking of You" is a song written and recorded by American singer and songwriter Katy Perry from her second studio album, One of the Boys (2008). It was written by Perry herself in 2002, a year after the release of her debut studio album, Katy Hudson (2001). The song was later recorded in 2008 and produced by Butch Walker, who held the sessions at his old "Deathstar" house, based in Los Feliz, Los Angeles. "Thinking of You" is a soft rock song that deals with a break-up in which Perry does not want to move on but has no choice, and feels nostalgic of a previous lover while in a relationship with another man. Retrospectively, "Thinking of You" has been described as a favorite among her fans.

The song was later released on January 12, 2009, as the album's third single, through Capitol Records. Upon its release, the song would peak at number 29 on the Billboard Hot 100 chart, becoming the album's only single not to reach the Top 10 in the United States, and Perry's first single not to do so, although the song would later be certified Platinum by the Recording Industry Association of America (RIAA). The song also peaked at number 27 in the UK singles chart, and was certified Silver by the British Phonographic Industry (BPI). Meanwhile, in South America, the song was included in the international soundtrack of Brazilian soap opera India, a Love Story and became very successful there due to its inclusion in the television series.

Two music videos were released for the song. The first was released in 2007, one year before its inclusion on One of the Boys, and features Perry in two different rooms—black and white—and was directed by a friend of hers. The second, for the commercial release in 2009, is set in the 1940s and features Perry playing a woman who lost her lover, a soldier (played by American actor Matt Dallas), in battle during World War II. Perry began playing the song during gigs as early as 2006, and performed the song on all of her concert tours as of 2025, including the Hello Katy Tour, the California Dreams Tour, the Prismatic World Tour, Witness: The Tour, and The Lifetimes Tour. The song was also performed at her MTV Unplugged set (2009), and appears in the Prismatic World Tour concert film The Prismatic World Tour Live (2015).