The Výrovka (also called Vavřinecký potok upstream) is a river in the Czech Republic, a left tributary of the Elbe River. It flows through the Central Bohemian Region. It is 61.9 km (38.5 mi) long.

The Výrovka originates in the territory of Uhlířské Janovice in the Upper Sázava Hills at the elevation of 493 m (1,617 ft) and flows to Kostomlátky, where it enters the Elbe River at the elevation of 181 m (594 ft). It is 61.9 km (38.5 mi) long. Its drainage basin has an area of 542.5 km (209.5 sq mi). The average discharge at its mouth is 1.94 m3/s.

The longest tributaries of the Výrovka are:

Tributary	Length (km)	River km	Side
Šembera	28.2	3.4	left
Bečvárka	21.7	23.2	right

The most populated settlement on the river is the town of Uhlířské Janovice, where the river originates. The river also briefly crosses the territory of Nymburk. The river further flows through the municipal territories of Uhlířské Janovice, Vavřinec, Zásmuky, Církvice, Barchovice, Toušice, Kouřim, Klášterní Skalice, Třebovle, Zalešany, Žabonosy, Plaňany, Vrbčany, Radim, Chotutice, Dobřichov, Ratenice, Vrbová Lhota, Písková Lhota, Kostelní Lhota, Hořátev, Zvěřínek, Písty, Nymburk and Kostomlátky.

There are 441 bodies of water in the basin area. The largest of them is the fishpond Vavřinecký with an area of 78 ha (190 acres), built directly on the river. A system of several small fishpond is located on the upper course of the river near the spring.

The upper course of the Výrovka is suitable for river tourism, but it is navigable only when water is released from Vavřinecký Pond.

• List of rivers of the Czech Republic

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