A family of GAZ-3937 Vodnik light high mobility multi-purpose army vehicles is manufactured by the Russian automaker GAZ.  This military vehicle is named after a male water spirit from the Slavic mythology. It is a Russian attempt to build a 4x4 tactical vehicle, similar to the US HMMWV. The Vodnik was first seen in 1995. A small number of pre-production vehicles were produced for trials and testing. These vehicles were tested in during the war in Chechnya. his multi-purpose vehicle is currently in service with the Russian Army. Also these vehicles saw combat during the war with Georgia. In 2006 Uruguay ordered 48 Vodniks.

Production of this military vehicle ceased in 2013 due to lack of orders. Russian Army preferred Tirg vehicles from the same automaker. The Tigr is broadly similar vehicle, however it is cheaper to produce and is more versatile.

The Vodnik has modular design. Vehicle has front and rear replaceable modules. Engine and driving compartment is located at the front of the vehicle. A wide range of modules can be fitted. Some sources report, that up to 26 modules have been developed. The rear module is used to transport up to 10 troops, cargo, shelters, or specialized equipment. The GAZ Vodnik can be fitted with various weapon systems, including heavy machine guns or 120-mm mortars. The main advantage of this utility vehicle is that it's modules can be replaced in field conditions. There are some armored variants of this vehicle. These provide protection against small arms fire and artillery shell splinters. Vehicle can use a mix of armored and unarmored modules, depending on the mission requirements.

The front module accommodates driver and one passenger. Vehicle can be configured with conventional cab or with a half-cab in which the passenger sits behind the driver. Driver and passenger access the vehicle via conventional doors or hatches.

The GAZ Vodnik can be powered by the GAZ-562 (175 hp), YaMZ-460 (160 hp) or HINO JO7C (165 hp) diesel engines. Some sources claim that Vodnik can be fitted with Caterpillar diesel engines. The engine is set back and is contained within the front module. It is coupled with a 5-speed manual transmission. Chassis uses components of theBRDM-2 and BTR-80 armored vehicles. The Vodnik has 4x4 type chassis and is fitted with a central tyre inflation system. The Vodnik has hermetic hull and is fully amphibious. On water it is propelled by it's wheels, however a single waterjet can be mounted. This military vehicle can operate in climatic conditions ranging from -40°C to +50°C.