The Loděnice is a river in the Czech Republic, a right tributary of the Berounka River. It flows through the Central Bohemian Region. It is 64.7 km (40.2 mi) long.

The name literally means 'shipyard' in Czech, but this is just a conincidence. The name is derived from the word loď (i.e. 'boat', 'ship') and the old Czech adjective loděná (řeka), meaning "the river on which boats are ridden". The river is also sometimes called Kačák, after the village of Kačice.

The Loděnice originates in the territory of Řevničov in the Džbán range at the elevation of 497 m (1,631 ft) and flows to Srbsko, where it enters the Berounka River at the elevation of 210 m (690 ft). It is 64.7 km (40.2 mi) long. Its drainage basin has an area of 270.2 km (104.3 sq mi).

The Loděnice has no significant tributaries. The longest tributary of the Loděnice is the brook Černý potok, a left tributary with a length of 7.7 km (4.8 mi).

The most populated municipality located directly on the river is Loděnice, named afer the river. The river also briefly crosses the territory of the town of Beroun. The river flows through the municipal territories of Řevničov, Třtice, Mšec, Mšecké Žehrovice, Stochov, Kačice, Tuchlovice, Kamenné Žehrovice, Doksy, Družec, Bratronice, Horní Bezděkov, Malé Kyšice, Chyňava, Unhošť, Svárov, Ptice, Nenačovice, Chrustenice, Loděnice, Svatý Jan pod Skalou, Beroun and Srbsko.

There are 229 bodies of water in the basin area. Many fishponds are built on the Loděnice, especially on its upper and middle course. The largest of them is Turyňský rybník with an area of 51 ha (130 acres).

The Loděnice alternately flows through several protected areas. The upper course is located within the Džbán Nature Park. The middle course in protected as the Povodí Kačáku Nature Park. The lower course flows through the Bohemian Karst Protected Landscape Area. In addition to the large-scale protected areas, the river flows through several small-scale specially protected areas:

• V Bahnách Nature Reserve (area 8.6 ha (21 acres); peat and bog deposits with aquatic, wetland and meadow communities of plants and animals, including rare species);
• Záplavy Nature Reserve (area 23.7 ha (59 acres); an important nesting site and migration stop for water birds and wetland birds);
• Kalspot Nature Monument (area 3.6 ha (9 acres); a wetland biotope rich in amphibians);
• Karlštejn National Nature Reserve (area 1,547.1 ha (3,823 acres); an extensive example of the typical nature of the Bohemian Karst).

• List of rivers of the Czech Republic

• River flow at Loděnice station – Flood Warning and Forecasting Service of the Czech Hydrometeorological Institute