"Tik Tok" (stylized as "TiK ToK" and pronounced as "tick tock") is a single by American singer Kesha, who co-wrote the song with its producers Dr. Luke and Benny Blanco. It was released on August 7, 2009, as the lead and debut single from her debut studio album, Animal (2010).

According to Kesha, the song's lyrics are representative of her and based on her life. In the lyrics, which have a carefree message, the narrator talks about not letting anything bring them down. "Tik Tok" is an electropop and dance-pop song incorporating Auto-Tune and a minimalist bitpop beat interspersed with handclaps and synthesizers. The verses use a rap/sing vocal style while the chorus is sung. Some critics complimented the production as catchy, but others took issue with it as generic and disposable compared to the mainstream pop music scene.

In the United States, "Tik Tok" spent nine weeks atop the Billboard Hot 100 and ended up being certified 12× platinum by the Recording Industry Association of America (RIAA). Topping the charts in many other countries including Australia—where it was certified ninefold platinum, Canada, France, Germany, Norway, and Switzerland, it was the best-selling single worldwide in 2010, selling 12.8 million copies. As of 2019, the song has now sold over 18 million digital copies worldwide, making it among the best-selling digital singles of all-time. Furthermore, it is currently listed as the 68th biggest Billboard Hot 100 hit of all time.