The Łutownia (Polish pronunciation: [wuˈtɔvɲa]; Belarusian: Лутоўня), in northeast Poland, is a left-bank tributary of the Narewka River. It was formerly known in Polish as the Łętownia [wɛnˈtɔvɲa], Lętownia [lɛnˈtɔvɲa], Łotownia [wɔˈtɔvɲa], Łutownica [wutɔvˈnit͡sa], Latownica [latɔvˈnit͡sa], Lutownia [luˈtɔvɲa], and Szczekotówka [ʂt͡ʂɛkɔˈtufka] River.

The Łutownia flows through the European region known as the Wysoczyzny Podlasko – Bialoruskie (Podlasie-Belarus Plateau) in Poland's Podlasie Province and Belarus' Hrodna Voblast. The river, from its origin to its mouth, flows through the Białowieża Forest.

Villages:

• Nowosady/Zwodzieckie
• Teremiski

Main tributaries (right bank):

• Dubinka
• Krynica

• P. Bajko, Łutownia, Czasopis, 03/2008, ss. 21–22.

• Encyklopedia Puszczy Białowieskiej
• Collection of 30 photographs of the river Łutownia
• E. Pierzgalski, J. Tyszka, A. Stolarek, Zmienność odpływu wody ze zlewni rzeki Łutowni (Puszcza Białowieska) w latach 1966-2000, Leśne Prace Badawcze, 2006, 1:21-36