Michael Alan Katsidis (Greek: Μιχάλης Κατσίδης; born 15 August 1980) is an Australian former professional boxer who competed from 2001 to 2017. He held the WBO interim lightweight title twice between 2007 and 2010, and challenged twice for the lineal lightweight title in 2008 and 2010. At the peak of his career in the late 2000s, Katsidis’ crowd-pleasing and aggressive pressure fighting style often drew comparisons with the late Arturo Gatti.
In an amateur career which began at the age of 11, Katsidis compiled a record of 75 wins and 6 losses. During this time he represented the Australian Olympic team in the lightweight division at the 2000 Olympics in Sydney. He also attained a scholarship at the Australian Institute of Sport.