Gráinne Murphy (born 26 March 1993) is a former swimmer who represented Ireland at international level.

She qualified for the 2012 Summer Olympics in London, though due to illness only swam the heats of the 400m Freestyle.

She was forced to withdraw from the rest of the meet, including her focus event (the 800m Freestyle), where she would have been in contention for a place in the final.

[3] Murphy has also been successful at senior level, winning a silver medal in the 1,500 metres Freestyle at the 2010 European Aquatics Championships, ahead of Erika Villaécija García and behind '09 World Championship Silver Medallist, Lotte Friis.

[6] However, on 31 July 2012, after swimming in the heats of the 400m freestyle, she revealed that she had been suffering from glandular fever and it forced her to withdraw from the rest of the competition.