The Leśna Prawa (Belarusian: Правая Лясная - "Pravaja Liasnaja" or "Pravaya Lyasnaya") is a river in north-eastern Poland and western Belarus. At its confluence with the Lyevaya Lyasnaya near Kamyanyets, the Lyasnaya is formed. The Lyasnaya is a right tributary of the Bug River northwest of Brest.
The Leśna Prawa flows through the geographical region of Europe known as the "Wysoczyzny Podlasko – Bialoruskie" (English: Podlasie and Belarus Plateau) located within the Podlaskie Voivodeship of Poland and the Hrodna Voblast of Belarus. Major part of the river flows through Puszcza Białowieska.
River flows through: Hajnówka, Topiło, Kamyanyets.
Tributaries: Łuch, Chwiszczej, Perebel, Przewłoka, Miedna.