Nina Rangelova (born 22 October 1990) is a Bulgarian swimmer.

[1] At the 2008 Summer Olympics, she competed in the women's 200 m freestyle, but did not progress beyond the heats.

[2] She competed at the 2012 Summer Olympics in the Women's 400 metre freestyle, finishing 23rd in the heats, failing to qualify for the final, but breaking the Bulgarian national record.

[3] At the FINA World Championships in Kazan, Russia, Rangelova qualified for her third Olympic Games in the 200 m Freestyle event with a time of 1:58:40, also setting a new Bulgarian record.

[2] In 2018 Rangelova married Lithuanian Olympic swimmer Mindaugas Sadauskas.