Lyudinovo is a Russian city, the administrative center of the Lyudinovo District in the Kaluga Region.

Its population makes 39 239 people (as of 2015). The city stands on River Nepolot (the basin of Desna), at the distance of 151 km from Kaluga, 80 km from Bryansk and 350 km from Moscow.

Lake Lompad surrounded with coniferous forest is one of the seven wonders of the Kaluga Region. Due to its artificial origin it is also called Lyudinovo Reservoir. River Nepolot originates from the lake. The lake and the river divide the city into two — the eastern and western part. The lake's width reaches one and a half kilometers within the city borders.

The Lyudinovo district located in the center of the East European Plain takes the area of 930 square km. This land lies on the ancient pre-Сambrian rock with some volcanic traces. There are fields of ceramic clays, sand, and phosphorites in the vicinity of Lyudinovo.

It has moderate and continental climate with strongly pronounced seasons of the year (warm summer, moderately cold winter with steady snow cover).

The local sights are St Sergius of Radonezh Church (late 19th century), the Trinity Church Belltower (1836), and the St. Parasсeve Church (mid 19th century).