Lena Frier Kristiansen
Lena Frier Kristiansen 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.
Achievements
European Championships
Women's doubles| Year | Venue | Partner | Opponent | Score | Result |
| 2008 | Herning, Denmark |  Kamilla Rytter Juhl |  Donna Kellogg Gail Emms | 21–18, 21–18 | Gold |
| 2006 | Den Bosch, Netherlands | Kamilla Rytter Juhl |  Juliane Schenk Nicole Grether | 21–9, 14–21, 15–21 | Bronze |
European Junior Championships
Mixed doubles| Year | Venue | Partner | Opponent | Score | Result |
| 2001 | Spała, Poland | Peter Hasbak | Rasmus Andersen Mette Nielsen | 10–15, 5–15 | Bronze |
BWF Superseries
The BWF Superseries, launched on 14 December 2006 and implemented in 2007, is a series of elite badminton tournaments, sanctioned by Badminton World Federation. BWF Superseries has two levels: Superseries and Superseries Premier. A season of Superseries features twelve tournaments around the world, which introduced since 2011, with successful players invited to the Superseries Finals held at the year end.Women's doubles
| Year | Tournament | Partner | Opponent | Score | Result |
| 2009 | World Superseries Finals | Kamilla Rytter Juhl |  Chin Eei Hui Wong Pei Tty | 17–21, 14–21 | Runner-up |
| 2009 | Denmark Open | Kamilla Rytter Juhl |  Pan Pan Zhang Yawen | 20–22, 21–18, 12–21 | Runner-up |
BWF Grand Prix
The BWF Grand Prix has two levels, Grand Prix and Grand Prix Gold. It is a series of badminton tournaments sanctioned by the Badminton World Federation since 2007. The World Badminton Grand Prix sanctioned by International Badminton Federation since 1983.Women's doubles
| Year | Tournament | Partner | Opponent | Score | Result |
| 2008 | Dutch Open | Kamilla Rytter Juhl |  Shendy Puspa Irawati Meiliana Jauhari | 21–16, 25–23 | Winner |
| 2004 | Dutch Open | Kamilla Rytter Juhl | Pernille Harder Helle Nielsen | 15–12, 15–8 | Winner |
Mixed doubles
| Year | Tournament | Partner | Opponent | Score | Result |
| 2004 | Dutch Open | Peter Steffensen | Thomas Laybourn Kamilla Rytter Juhl | 11–15, 7–15 | Runner-up |
BWF International Challenge/Series
Women's doubles| Year | Tournament | Partner | Opponent | Score | Result |
| 2008 | Finnish International | Kamilla Rytter Juhl |  Ekaterina Ananina Anastasia Russkikh | 21–17, 21–15 | Winner |
| 2006 | Dutch International | Kamilla Rytter Juhl | Juliane Schenk Nicole Grether | 8–21, 12–21 | Runner-up |
| 2004 | Dutch International | Kamilla Rytter Juhl |  Petya Nedelcheva Neli Boteva | 10–15, 6–15 | Runner-up |
| 2002 | Portugal International | Kamilla Rytter Juhl | Lene Mørk Helle Nielsen | 2–7, 3–7, 0–7 | Runner-up |
| 2002 | Slovenian International | Karina Sørensen | Ekaterina Ananina Anastasia Russkikh | 7–11, 5–11 | Runner-up |
| 2001 | Irish International | Kamilla Rytter Juhl | Lene Mørk Helle Nielsen | 3–7, 3–7, 2–7 | Runner-up |
Mixed doubles
| Year | Tournament | Partner | Opponent | Score | Result |
| 2003 | Croatian International | Rasmus Andersen | Carsten Mogensen Kamilla Rytter Juhl | 2–11, 3–11 | Runner-up |