RyanDan (born December 5, 1979) is a Canadian musical, songwriting and producing duo, consisting of identical twins Ryan and Dan Kowarsky, whose music is a mix of pop, opera, and classical.

They were originally part of the boy band b4-4 (renamed Before Four for European later releases) that also included Ohad Einbinder. They later on worked as a vocal duo as RyanDan. They have also produced for a number of mainly Canadian artists including Blake McGrath, Shawn Desman, Danny Fernandes, Tyler Medeiros, Mia Martina and Massari and others.