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|Competitor for Ireland|
|European Indoor Championships|
|Bronze||2013 Gothenburg||3000 m|
|European Cross Country Championships|
Fionnuala Britton (born 24 September 1984) is an Irish runner who specializes in the 3000 metres steeplechase. She was the gold medallist at the 2011 and 2012 European Cross Country Championships. She has represented Ireland in the steeplechase at the 2008 Beijing Olympics, the 2009 World Championships in Athletics, and twice at the European Athletics Championships. In December 2012, Britton became the first woman to successfully defend the European Cross Country Championship.
She began her international junior career in cross country running in 2001, highlighted by 33rd place at the 2003 IAAF World Cross Country Championships. She won a steeplechase silver at the 2006 European Cup and also competed in the event at the European Athletics Championships, being eliminated in the heats. She took the under-23 silver medal at the 2006 European Cross Country Championships at the end of the year. She was fourteenth in the senior race at the 2007 IAAF World Cross Country Championships – the second best European performer behind Jessica Augusto (12th). She made her global track debut at the 2007 World Championships in Athletics and was twelfth in the steeplechase final. She ended the year with a seventh place finish at the 2007 European Cross Country Championships.
She made her Olympic debut at the 2008 Summer Games in Beijing, but did not make the women's steeplechase final. She came eleventh at the 2009 European Cross Country Championships which was held in her home city of Dublin. Britton was also eleventh in the steeplechase final at the 2010 European Athletics Championships. She just missed out on a medal at the 2010 European Cross Country Championships, finishing with the same time as bronze medallist Ana Dulce Félix. She took second place at the Lotto Cross Cup Brussels a week later.
In preparation for the world competition, she ran at the Almond Blossom Cross Country in March 2011 and took second place. She managed 16th place at the 2011 IAAF World Cross Country Championships in Punta Umbría. She ran a personal best of 15:31.26 minutes for the 5000 metres at the FBK Games in June then ran a steeplechase best of 9:37.60 minutes at the Adidas Grand Prix in New York. Britton represented Ireland on the track at the 2011 World Championships in Athletics, narrowly being eliminated in the first stage of the steeplechase. In November she came third at the high-level Cross de l'Acier cross country race. In December 2011, she won the gold medal at the 2011 European Cross Country Championships.
She began 2012 with wins at the Great Edinburgh Cross Country and Antrim Cross Country. She expressed her disappointment that the World Cross Country would not be held that year, and stated that she would focus on track running that year instead. In December of that year she became the first woman to defend the continental cross title  claiming victory at the 2012 European Cross Country Championships.
- 1500 metres - 4:18.03 min (2011)
- 3000 metres - 8:55.01 min (2012)
- 3000 metres - 8:54.37 min (2013)(Indoor)
- 5000 metres - 15:12.97 min (2012)
- 10000 metres - 31:29.22 min (2012)
- 3000 metres steeplechase - 9:37.60 min (2011)
- Britton, Fionnuala. IAAF. Retrieved on 2010-12-19.
- 2007 World XC Championships - Women's Senior Race Results. IAAF. Retrieved on 2010-12-19.
- Hendrix, Ivo (2009-12-20). Lalli and Herzog triumph in wintry Brussels. IAAF. Retrieved on 2010-02-08.
- Fernandes, António Manuel (2011-03-06). Kalovics and Menjo cruise to victories in Albufeira. IAAF. Retrieved on 2011-03-06.
- Britton Fionnuala. IAAF. Retrieved on 2011-12-01.
- Delporte, David (2011-11-28). Joseph Ebuya n'a jamais laissé planer le doute (French). La Voix de Sports. Retrieved on 2011-12-01.
- "Britton breezes to gold in Slovenia". RTE Sport. 11 December 2011. Retrieved 15 December 2011.
- "Gold puts the great in Britton". Irish Examiner. 13 December 2011. Retrieved 15 December 2011.
- Duffy, Coilin (2012-01-21). Kigen makes it a hat-trick; Britton takes women’s race win in Antrim. IAAF. Retrieved on 2012-01-22.
- Wenig, Jorg (2012-01-07). Kiprop triumphs in race of champions, Bekele a distant 11th - Edinburgh XC report. IAAF. Retrieved on 2012-01-08.
- Turnbull, Simon (2013-01-06). . Retrieved on 2013-01-22.
- "Fionnuala Britton adds to medal haul with European bronze". Irish Independent. 3 March 2013. Retrieved 8 March 2013.
- "Fionnuala Britton takes superb bronze in Sweden". RTE Sport. 3 March 2013. Retrieved 8 March 2013.