The Luzha is a river in Kaluga Oblast, Russia, which originates in Moscow Oblast. It is a right tributary of the Protva. The Luzha has a length of 159 km (99 mi) and a drainage basin area of 1,400 km2 (540 mi2). The Luzha freezes up in November and breaks up in April. The town of Maloyaroslavets, the site of an important battle in 1812 during the French invasion of Russia, is located on the Luzha.