| Birth Place: | Bydgoszcz, Poland |
| Height: | 170 cm |
| Weight: | 68 kg |
| Sport: | Canoe sprint |
| Coach: | Wieslaw Rakowski (club) Tomas Kryk (national) |
| Club: | UKS Kopernik |
| Show-Medals: | yes |
Beata Mikołajczyk (Polish pronunciation: ; born 15 October 1985) is a Polish canoe sprinter. She competed at the 2008, 2012 and 2016 Olympics, in two events for each games; she won one silver and two bronze medals and placed fourth two times.
Mikołajczyk took up canoeing in 1996 in her native Bydgoszcz. She won the silver medal in K-2 500 m event at the 2008 Summer Olympics in Beijing with Aneta Pastuszka-Konieczna. She won the bronze medal in K-2 500 m event at the 2012 Summer Olympics in London with Karolina Naja. She also won a gold in the K-2 1000 m event at the 2009 ICF Canoe Sprint World Championships in Dartmouth.
In June 2015, she competed in the inaugural European Games for Poland in canoe sprint, more specifically, Women's K-4 500m with Ewelina Wojnarowska, Edyta Dzieniszewska, and Karolina Naja. She earned a bronze medal.
For her sport achievements, she received: