Martyna Radosz née Mikołajczak (born 12 May 1991 in Bydgoszcz[2]) is a Polish rower, European champion in 2017 in lightweight double sculls, silver medalist at the 2015 Summer Universiade, and world university champion (2014).

At the 2016 Summer Olympics in Rio de Janeiro,[3] she finished 7th in lightweight double sculls.

From 2007 to 2010, she attended the VIII High School in Bydgoszcz, in a sports class with a rowing profile.

Her greatest career successes include winning the world university championship in 2014 in lightweight double sculls (with Monika Kowalska)[4] and the silver medal at the 2015 Summer Universiade in the same event (also with Monika Kowalska).

[8] On 19 December 2016, she, along with Miłosz Jankowski, set a world record in the 100 km rowing ergometer mixed pair age group 20–29, with a time of 6 hours 15 minutes 6.5 seconds.