RRK may refer to:
Rahsaan Roland Kirk (1935–1977), American jazz multi-instrumentalist Revised Romanization of Korean, the Korean language romanization system of South Korea R. R. Keshavamurthy (1913–2006), Indian violinist Reinhard Rudolf Karl Hartmann, lexicographer and linguist Rice–Ramsperger–Kassel theory of chemical reactions, a precursor to RRKM theory