Lena Frier Kristiansen (born March 12, 1983) is a badminton player from Denmark.
In 2001, she won the silver and bronze medals at the European Junior Championships in the mixed team and doubles respectively.
Partneres with Kamilla Rytter Juhl, they won the bronze medal the 2006 European Championships in the women's doubles event, and made it to the gold medal in 2008.
They also competed at the 2008 Beijing Olympic Games, but was defeated in the first round by the Japanese pair Kumiko Ogura and Reiko Shiota in the rubber games.