The Orlen Warsaw Marathon is an annual road running event over the marathon distance that takes place in April on the streets of Warsaw, Poland. The event was established in 2013 and has Polish oil company PKN Orlen as its title sponsor. It was the second annual marathon race for the city, following on from the success of the Warsaw Marathon, which has been held in the city, generally in September, since 1979.

The marathon is a long-distance foot race with a distance of 42.195 km, usually run as a road race, but the distance can be covered on trail routes. The marathon can be completed by running or with a run/walk strategy. There are also wheelchair divisions. More than 800 marathons are held throughout the world each year, with the vast majority of competitors being recreational athletes, as larger marathons can have tens of thousands of participants.