Lena Grebak (born 18 September 1991) is a Danish badminton player.

[1][2] In 2015, she won the bronze medal at the European Games in the women's doubles event partnered with Maria Helsbøl.

[3] In 2016, she also won the bronze medal at the European Championships in the mixed doubles event partnered with Mathias Christiansen.

[4] Women's doubles Mixed oubles Women's doubles Mixed doubles