Patrick Gerard Barnes (born 9 April 1987) is an Irish former boxer who competed as an amateur from 2005 to 2016 and as a professional from 2016 to 2019. As an amateur he competed in the light-flyweight division, representing Ireland at the 2008, 2012, and 2016 Olympics; winning bronze medals in Beijing and London, and represented Northern Ireland at the 2010 and 2014 Commonwealth Games; winning a gold medal at both events. As a professional, he challenged for the WBC flyweight title in 2018.