The Luha (Ukrainian: Луга, Polish: Ług) is a river in Ukraine and a right tributary of the Bug. Its source is located near the village of Kolpytiv in the Horokhiv Upland. In its upper reaches, the Luha runs mainly in a western, northwestern direction, and later northwards. In its lower stream, it runs mainly in a northwestern direction and enters the Western Bug on northwestern outskirts of the city of Ustyluh.

Biggest tributaries: Luha-Svynoryika, Svynoryika, Rylovytsia (right side); Strypa (left side)

Character of the river is plain as it flows through swampy floodplains.

Major settlements along the river: Volodymyr, Ustyluh

In 2000, local hydrological reserve "Luha" was created along the river.