"Illella" (Korean: 일낼라; lit. get up; occasionally stylized as "1llella") is a song by South Korean girl group Mamamoo. It was released through RBW and Kakao Entertainment on October 11, 2022, as the lead single from their twelfth extended play Mic On. It was co-written by Moonbyul, Yoo Joo-yi, Kang Ji-won, Kim Do-hoon, and Inner Child, the latter three of whom also handled the song's production. Described as a K-pop and reggaeton track, it was met with positive reviews from critics who praised the group for their vocal harmonies.