Stary Olsa (Belarusian: Стары Ольса) is a Belarusian medieval folk rock band, that plays medieval Ruthenian music of the Grand Duchy of Lithuania. The band has also released classical rock cover works in their Medieval Classic Rock where classical rock songs performed by bagpipes.

Stary Olsa is one of the few Belarusian bands enjoying popularity outside Belarus. The band has received numerous positive critical reviews. They are also known for covering modern rock tracks using their medieval instruments, and released a cover album, via a Kickstarter campaign, in 2016.

The band was founded in 1999 by Źmicier Sasnoŭski. The name Stary Olsa means "Old Olsa", where Olsa is a left tributary of Berezina in Mogilev Oblast, Belarus.