Signy Aarna (born 4 October 1990) is an Estonian footballer who plays as a forward for Finnish club Åland United and for the Estonia national team.

From Ahja, Põlva County, Aarna started training with the youth team of FC Lootos as a goalkeeper in 2003.

After the end of season 2013, Aarna signed her first professional contract with Naisten Liiga club Pallokissat in Finland.

2015 proved to be another productive season for Aarna, as she scored 17 goals in Naisten Liiga and she became again the club's top scorer.

[3] Aarna debuted for the senior national team in the 2009 Baltic Cup, starting her first game on 24 April 2009 against Latvia and scoring Estonia's fifth and final goal on her home ground, Lootospark.