SYN /sɪn/ (ACMA callsign: 3SYN) is an Australian community radio station broadcasting to Melbourne, Victoria.

First broadcast in January 2003, the station is operated by SYN Media under a youth license, with programming presented entirely by volunteers aged 12–25 years old.

[4] This followed the amalgamation of 3TD at Thornbury Darebin College and the Student Radio Association based at RMIT University into SYN Media in 2000.

On 7 May 2013, the station ceased transmitting on both FM and DAB+ for 24 hours in protest of funding cuts to the community radio sector in the 2013 Australian federal budget.

Flagship shows operate year round in fixed timeslots under the management of an executive producer, a role rotated yearly, while seasonal shows air for up to six months at a time, and cover a variety of topics and music.