"When I Think of You" is the third single from Janet Jackson's third studio album, Control (1986). Written by Jackson and Jimmy Jam and Terry Lewis, and produced by Jam and Lewis, the song is about a person who finds relief and fun in a lover. It was Jackson's first number-one hit on the Billboard Hot 100, and also peaked at number ten in the United Kingdom.

Pitchfork included the song in their Top 200 80's Songs of All-time list at #48.

The song was resurrected in 1995 when released on two limited-edition CD single formats in the United Kingdom, one containing remixes by Deep Dish and Heller & Farley, and the other containing remixes by David Morales. That same year these remixes were included on certain releases of "Runaway". "When I Think of You" has been included in each of Jackson's greatest hits albums, Design of a Decade: 1986–1996 (1995), Number Ones (2009) and Icon: Number Ones (2010).

The single became Jackson's first number-one hit on the Billboard Hot 100 chart, where it stayed for two weeks. After "When I Think of You" reached number one, it made Jackson and her brother Michael Jackson the first, and so far, only siblings to both have solo number-one hits on the Hot 100. At the time she was 20 years old, making Jackson the youngest artist since Stevie Wonder to top the Billboard Hot 100. It also reached number three on the Hot R&B/Hip-Hop Songs and number one on the Hot Dance Club Play in 1986. "When I Think of You" was the 32nd biggest Hot 100 single of 1986, as well as the 47th biggest Hot R&B/Hip-Hop Songs single of 1986 and the 22nd biggest Hot Dance Club Play single of 1986.

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