8] 1813) was a Baltic German lieutenant general and military governor of Riga at the start of the Patriotic War of 1812.

After unsuccessful attempts to stop the Prussians at a distance from the city and unsuccessfully fighting to save Iecava, he ordered the burning of the suburbs but because of a strong wind the fire got out of control and thousands of city residents were left homeless.

The Prussian corps became overextended, Macdonald remained inactive, a Russian successes was won by Peter Wittgenstein at Polotsk, Napoleon began a general retreat and Fabian Steinheil arrived in Riga - all these circumstances brought Essen to the top of the pile, but due to mismanagement the Russians were unable to capitalise on these victories and suffered heavy losses in several battles.

In October Essen was replaced in his post by General Paulucci and filed his resignation.

Essen then went for a long course of treatment at the Baldone sulphur baths near Riga, where he drowned on 23 August 1813 while swimming.