Riku Immonen is a retired Finnish professional Muay Thai kickboxer and active muay thai coach.

He is an amateur and professional Muay Thai World Champion.

Most well known students are UFC fighter Makwan Amirkhani, Topi Helin and Daniel Forsberg.

Made short comeback in 2014 at age of 40 to fight singer Daniel Landa.

Short humorous stories of "Adventures of Harley-Davidson man" at motorcycle forum moottoripyora.org became popular and Immonen decided to publish his first book "HD-miehen seikkailut" in 2008.