"Cheer Up" is a song recorded by South Korean girl group Twice, the lead single of their second extended play (EP) Page Two. It was released on April 25, 2016 by JYP Entertainment and distributed by KT Music. It is written and composed by Sam Lewis and Black Eyed Pilseung respectively.

The song is the best-performing single of 2016, as it charted number one on Gaon Digital Chart. It also won several awards including Song of the Year in two major music awards shows, Melon Music Awards and Mnet Asian Music Awards.

"Cheer Up" has lyrics written by Sam Lewis and music by Black Eyed Pilseung, the same team who wrote Twice's hit single "Like Ooh-Ahh" from their debut EP. It is a dance-pop song that incorporates multiple genres, including hip hop, tropical house, and drum and bass; this blend was described as "color pop". Lyrically, the song emotes tease and frustration about a love interest.

The music video for "Cheer Up" was directed by video production team Naive (Kim Young-jo and Yoo Seung-woo). It went viral on YouTube soon after it was uploaded on April 25, 2016 gaining 400,000 views in only thirty minutes. It reached one million views in less than a day, and surpassed seven million views on April 27.

In the music video, the members portray characters from famous films. Mina is Itsuki Fujii from Love Letter, Sana is Sailor Moon, Nayeon is Sidney Prescott from the Scream film series, Tzuyu is Holly Golightly (Audrey Hepburn) from Breakfast at Tiffany's, and Jeongyeon is Faye Wong in Chungking Express. Momo is an action heroine reminiscent of Tomb Raider, Jihyo is a cheerleader from Bring It On, Chaeyoung is a cowgirl (reminiscent of Western films A Fistful of Dollars), and Dahyun is gisaeng Hwang Jini (from the biopic Hwang Jin Yi). In the group dance scenes, the members are cheerleaders at a pep rally in a soccer stadium and a basketball stadium and in another dance scene, they are in front of a house, decorated as if hosting a party, wearing casual clothing.

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