Kaja Grobelna (born 4 January 1995 in Radom) is a Belgian volleyball player of Polish origin, playing as an opposite spiker.

She played for the Belgium women's national volleyball team, at the 2017 FIVB Volleyball World Grand Prix.

Since the 2018/2019 season, she has played for Unet E-Work Busto Arsizio.

Now, she is currently playing for the Queenseis Kariya for the 2024/2025 season.

This biographical article related to Belgian sports is a stub.