National road 15 (Polish: Droga krajowa nr 15) is a 374 km long G class and GP class[1] national road connecting Trzebnica with Ostróda.

It runs through Lower Silesian Voivodeship, Greater Poland Voivodeship, Kuyavian-Pomeranian Voivodeship and Warmian-Masurian Voivodeship.

It serves an alternative to National road 5 on Trzebnica - Gniezno segment while skipping Poznań.

Later on it leads through farming lands in Kuyavia to Masuria.

It crosses A2 motorway in Września.