This is a list of episodes of the South Korean variety-music show King of Mask Singer in 2021. The show airs on MBC as part of their Sunday Night lineup. Due to the COVID-19 pandemic, the show would be recorded without any audience in the episodes, and the matches' results would be decided by the celebrity panelists. The names listed below are in performance order.
– Contestant is instantly eliminated by the live audience and judging panel
– After being eliminated, contestant performs a prepared song for the next round and takes off their mask during the instrumental break – After being eliminated and revealing their identity, contestant has another special performance. – Contestant advances to the next round. – Contestant becomes the challenger. – Mask King.
Episodes
144th Generation Mask King (cont.)
Contestants: Elly (Weki Meki), Jeong Minseong (La Poem), Chan (Victon), Outsider, Nam Hyun-hee, Shin Hyun-woo (), ,
Episode 288 was broadcast on January 3, 2021.
145th Generation Mask King
Contestants: Yoo Seung-beom, , , Jae-gyun Hwang, ₩uNo, Yubin, Lee Young-hyun (Big Mama), Suyun (Rocket Punch)
Episode 289
Episode 289 was broadcast on January 10, 2021. This marks the beginning of the Hundred-forty-fifth Generation.
Episode 290
Episode 290 was broadcast on January 17, 2021.
146th Generation Mask King
Contestants: Park Si-hwan, Go Young-yeol (Second Moon/RabidAnce), Jaejae, , , Son Ah-seop, Yves (Loona), Kim Ki-bum
Episode 291
Episode 291 was broadcast on January 24, 2021. This marks the beginning of the Hundred-forty-sixth Generation.
Episode 292
Episode 292 was broadcast on January 31, 2021.
147th Generation Mask King
Contestants: Han Hee-jun, Kim Na-young, Lee Eun-gyeol, Kim Shin-eui (Monni), , Ahn Sung-joon, Lee Joo-hyuk (), Punch
Episode 293
Episode 293 was broadcast on February 7, 2021. This marks the beginning of the Hundred-forty-seventh Generation.
Episode 294
Episode 294 was broadcast on February 14, 2021.
148th Generation Mask King
Contestants: , Jiseon (Loveholics), Taeil (Block B), Shinsadong Tiger, Minnie ((G)I-dle), Nadeul (), New (The Boyz),
Episode 295
Episode 295 was broadcast on February 21, 2021. This marks the beginning of the Hundred-forty-eighth Generation.
Episode 296
Episode 296 was broadcast on February 28, 2021.
149th Generation Mask King
Contestants: Kim Chae-won (Iz*One), Kwon Jin-ah, Kim Boa (), , Park Sang-min, , Choi Jung-yoon, Kim Jun-ho
Episode 297
Episode 297 was broadcast on March 7, 2021. This marks the beginning of the Hundred-forty-ninth Generation.
Episode 298
Episode 298 was broadcast on March 14, 2021.
150th Generation Mask King
Contestants: , Do Sang-woo, , DJ Tukutz (Epik High), , , Hong Young-joo, Kim Hyun-jung
Episode 299
Episode 299 was broadcast on March 21, 2021. This marks the beginning of the Hundred-fiftieth Generation.
Episode 300
Episode 300 was broadcast on March 28, 2021.
151st Generation Mask King
Contestants: (), Juvie Train (), Go Yoo-jin (Flower), , , , , Lee Seung-yeon
Episode 301
Episode 301 was broadcast on April 4, 2021. This marks the beginning of the Hundred-fifty-first Generation.
Episode 302
Episode 302 was broadcast on April 11, 2021.
152nd Generation Mask King
Contestants: , Song Bong-joo (), , Park Sung-joon (A.R.T), , , , Lee Joo-woo
Episode 303
Episode 303 was broadcast on April 18, 2021. This marks the beginning of the Hundred-fifty-second Generation.
Episode 304
Episode 304 was broadcast on April 25, 2021.
153rd Generation Mask King
Contestants: Kang Seung-hee (Wink), Kang Joo-hee (Wink), Gil Byung-min (), Ryu Seung-min, Rocky (Astro), Yoon Hyun-sook (), , Sohee (Elris)
Episode 305
Episode 305 was broadcast on May 2, 2021. This marks the beginning of the Hundred-fifty-third Generation.
Episode 306
Episode 306 was broadcast on May 9, 2021.
154th Generation Mask King
Contestants: , , Mo Tae-bum, Bae Jin-young (CIX), , Lee Young-ji, , Jeon In-hyuk ()
Episode 307
Episode 307 was broadcast on May 16, 2021. This marks the beginning of the Hundred-fifty-fourth Generation.
Episode 308
Episode 308 was broadcast on May 23, 2021.
155th Generation Mask King
Contestants: , Kim Sang-hyuk (Click-B), , , Kim Dong-han (WEi), , , Jang Yoon-jeong
Episode 309
Episode 309 was broadcast on May 30, 2021. This marks the beginning of the Hundred-fifty-fifth Generation.