Yumi's Cells (Korean: 유미의 세포들; RR: Yumiui Sepodeul) is a 2021 South Korean television series directed by Lee Sang-yeob and starring Kim Go-eun, Ahn Bo-hyun, Park Jin-young, Lee Yu-bi, and Park Ji-hyun. Based on the eponymous webtoon, it is a cell-based psychological romance that unravels the daily life of an ordinary office worker Yumi through the eyes of the cells in her head. The series premiered on tvN on September 17, 2021, and aired every Friday and Saturday at 22:50 (KST). It was also released simultaneously on both online streaming services TVING and iQIYI.

On September 8, 2021, TVING announced that the drama had sold broadcast rights in more than 160 countries around the world, including Europe, North America and Southeast Asia.

The second season premiered exclusively on TVING on June 10, 2022, releasing two episodes every Friday at 16:00 (KST). It was later aired on tvN from November 16, 2022, every Wednesday and Thursday at 22:30 (KST).

On September 15, 2022, it was announced that season 2 had been sold to Amazon Prime Video for broadcasting in Japan. Season 2 was also available on Amazon Prime Video in Indonesia, Thailand and the Philippines.