Ria Kataja (born 15 October 1975, in Tampere) is a Finnish actress.
Kataja studied at the Theatre Academy Helsinki. She was seen in a television series Kotikatu since 2003 and in Taivaan tulet since 2007. She has also appeared in several films, such as Black Ice (2007) and Open Up to Me (2013).
Ria Kataja was married to actor Tommi Eronen, and together they have two children. The couple divorced in 2012.