"Lotto" is a song recorded by South Korean boy group EXO for the repackage edition of their third studio album Ex'Act. It was released in Korean and Chinese versions by S.M. Entertainment on August 18, 2016.

Produced by LDN Noise, "Lotto" is described as "hip-hop" song enhanced by the heavy Auto-Tune with the lyrics about a man feeling so lucky, like he won the lottery after meeting the girl he love. The song was released on August 18 together with the repackage album. Exo began performing the song on South Korean music TV shows on the following day.

The Korean and Chinese music videos for "Lotto" were released on August 18, 2016. The music video described as a "casino theme" like music video and opens with the sound of a slot machine. Apart from Exo's performing the song's high-powered choreography, it also shows scenes of the members gambling, watching cock fights, burning piles of money, and other risk-driven activities before they and a female co-star are taken down by a S.W.A.T. team. The Korean version was the tenth most-watched K-pop music video on YouTube in 2016.

EXO began performing the song on South Korean music television programs on August 19. Member Kai was absent from promotional activities due to an injury he sustained during the concert tour. "Lotto" was deemed "unfit for broadcast" by KBS, MBC and Mnet, thus was promoted with modified lyrics under the alternative title "Louder" on these TV channels.

"Lotto" debuted at number two on the Gaon weekly digital chart and at number one on the Billboard World Digital Songs chart. The song went on to win first place seven times in total on South Korean weekly music television shows.

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