List of K-pop girl groups and female solo artists who made their debuts in 2021.
PC: Original Owners
2021 Debuts: K-pop Girl Groups & Female Solo Artists
Girl Groups

TRI.BE
MELLOW Entertainment
Debut: February 17
Fandom: TRUE

PIXY
ALLART Entertainment
Debut: February 24
Fandom: WINXY

HOT ISSUE
S2 Entertainment
Debut: April 28
Fandom: SURE

bugAboo
A team Entertainment
Debut: October 25
Fandom: Rainboo

Billlie
MYSTIC STORY
Debut: November 10
Sub-Unit
WJSN

WJSN THE BLACK
Starship Entertainment
Debut: May 12
Solo Artists
DIA

YEBIN
POCKETDOL Studio
Debut: July 7

ADORA
AURA Entertainment
Debut: November 5
2020 Debuts | 2021 Debuts | 2022 Debuts