Gerald Melzer (born 13 July 1990) is a professional Austrian tennis player. He achieved a career-high singles ranking of world No. 68 in November 2016.
Gerald Melzer has primarily spent his time on the Futures circuit, while also playing Challengers and several doubles events with his brother. He began playing on the tour in 2007, competing in tournaments in Austria as well as Futures tournaments in Africa.
In 2008, he has had more success playing doubles, partnering with his brother to win a challenger in Graz, Austria.
In 2015, as a qualifier, Gerald reached the semifinals of Munich.
He faced his brother, Jürgen, in the first round of the 2015 Wimbledon qualifying tournament, and lost in straight sets. Jürgen described it as the "worst tennis day of my life and I hope we will never play each other again."
At the 2017 Australian Open, Melzer lost in the first round to Australian Alex de Minaur in five sets. He held a match point in the fourth set, but was unable to close it out.
Gerald is also part of Austrian Davis Cup team, for which he recorded four singles wins and six losses.