Colin Ebelthite (born 27 November 1984) is a professional Australiantennis player.
Ebelthite's highest ATP singles ranking is World 209, which he reached on 23 June 2008. His career high in doubles was at 98 set at 17 September 2012. The South Australian won three Futures titles including Sorrento (WA), Perth and Wellington. Ebelthite joined the Australian Institute of Sport (AIS) Pro Tour squad in January. His impressive run has seen his ranking rocket to a career high 230, an outstanding feat given only sixteen months ago he was ranked No.703 in the world. While qualifying for his grand slam he defeated Australian rising talent Bernard Tomic. Ebelthite competed in the Australian Open in 2009 where he was knocked out in the first round by Andreas Beck 5-7, 1-6, 0-6.