Ryan William Mullen (born 7 August 1994) is an Irish professional racing cyclist, who currently rides for UCI WorldTeam Red Bull–Bora–Hansgrohe.

In February 2014, Mullen finished 4th in the Elite Men's Individual Pursuit at the UCI track world championships in Cali, Colombia.

He took the silver in the under-23 time trial at the 2014 UCI Road World Championships in Ponferrada, finishing half a second behind winner Campbell Flakemore of Australia.

He was at a disadvantage because he did his ride in wet conditions and finished eleventh, 49 seconds behind the winner, Mads Würtz Schmidt.

[13] In an interview with Cyclingnews.com Mullen confirmed he was likely to make his Grand Tour debut at the Giro d'Italia, where he was targeting the Time-Trial on stage 1 in Jerusalem.