Piotr Krzysztof Liroy-Marzec (born July 12, 1971, in Busko Zdrój, Poland as Piotr Krzysztof Marzec), better known as Liroy (Leeroy), is a Polish rapper and politician.

He is one of the pioneers of rap and hip-hop culture in Poland. His CDs include East On Da Mic (as PM Cool Lee), Albóóm, Bafangoo Part 1, L, Bafangoo Part 2 (Dzień Szaka-La), Bestseller and L-Nińo vol. 1.

In 2015, he retired from his music career and was elected as a member of the Sejm. He was a part of Kukiz'15, representing Kielce. He was then an independent lawmaker. In 2017 he founded a political association, Skuteczni. At the end of 2018 he joined the Propolish Coalition later renamed to Confederation KORWiN Braun Liroy Narodowcy.

He was the chairman of the parliamentary group on medical marijuana.