Oshkosh Corporation, formerly Oshkosh Truck, is an American industrial company that designs and builds specialty trucks, military vehicles, truck bodies, airport fire apparatus and access equipment. The corporation also owns Pierce Manufacturing, a fire apparatus manufacturer in Appleton, Wisconsin. Based in Oshkosh, Wisconsin, the company employs 12,000 people around the world. It is organized in four primary business groups: access equipment, defense, fire and emergency, and commercial.

Founded in 1917 as the Wisconsin Duplex Auto Company, the company was created to build a severe-duty four-wheel-drive truck. After the first prototype was built, the company began to develop rapidly. This first four-wheel-drive truck, known today as "Old Betsy", is still owned by Oshkosh Corporation and housed in one of its assembly plants in Oshkosh. The vehicle still runs and is used frequently in demonstrations and parades. The first mass-produced truck was the 2-ton Model A, with seven produced in 1918. The 3.5-ton Model B and 5-ton Model F followed. The Model TR, introduced in 1933, was a diversification for the company and was the first rubber tired earthmover ever built.

The Model 50-50, introduced in 1955, was the first truck created specifically for the hauling of concrete. The first ARFF built by Oshkosh was a W Series truck delivered to the U.S. Coast Guard in 1953. Oshkosh has also produced aircraft tow tractors, and in 1968 the company designed and built the U-30, 45 of which were built for the U.S. Air Force to tow the Lockheed C-5 Galaxy transport aircraft.

In 1976 the company won a U.S. Army contract to supply 744 M911 heavy equipment transporters, the first in a long line of U.S. Army contracts that now sees Oshkosh Defense as the sole supplier of medium and heavy tactical trucks to the U.S. Army and Marines.

On August 25, 2015, Oshkosh was awarded the U.S. military's Joint Light Tactical Vehicle contract. The initial JLTV award is valued at $6.75 billion for up to 16,901 vehicles. The procurement objective for JLTV stands at 54,599 vehicles (49,099 Army; 5500 Marines), the estimated program cost being $47.6 billion. JLTV will partially replace the AM General Humvee.

Oshkosh Corporation is headquartered in Oshkosh, Wisconsin. It has manufacturing operations in eight U.S. states and in Australia, Belgium, Canada, China, France and Romania and through investments in joint ventures in Mexico and Brazil. The Access Equipment division is headquartered in McConnellsburg, Pennsylvania; the Defense division in Oshkosh, Wisconsin; the Fire & Emergency division in Appleton, Wisconsin; and the Commercial division in Dodge Center, Minnesota.

Oshkosh products and services are sold in more than 130 countries around the globe. The company also maintains a global service network.

Oshkosh Corp. manufactures, distributes and services products under the brands of Oshkosh, JLG, Pierce, McNeilus, Jerr-Dan, Oshkosh Specialty Vehicles, Frontline Communications, CON-E-CO, London Machinery Inc., and IMT.

Products include JLG and SkyTrak brand telehandlers, wheeled and tracked boom lifts, and other lifting equipment.

2016 Oshkosh L-ATV (configured as JLTV) equipped with EOS R-400S-MK2 remote weapon system armed with Orbital ATK’s M230 LF 30 mm lightweight automatic chain gun

HEMTT M1120A4 in A-kit configuration - without cab armor, the B-kit

An Oshkosh-produced M1083 A1P2 5-ton MTV in A-kit configuration

Oshkosh M-ATV with mine roller and TerraMax autonomous system

This Oshkosh MTVR MK23/MK25, on which the Oshkosh TAK-4 independent coil-spring suspension is clearly visible, is fitted with an armored cab

USMC Oshkosh Logistic Vehicle System Replacement (LVSR)

Oshkosh M1070A0 tractor, M1000 semi-trailer and M88 ARV payload

Oshkosh M1075 Palletized Load System (PLS) truck

M911 HET on M48A2 launcher bridge

Oshkosh P19-R Aircraft Rescue and Fire Fighting (ARFF) vehicle

Charlotte-Douglas Airport Oshkosh Striker

USAF Oshkosh P-15 8x8 airport crash tender

USAF Oshkosh T-3000 6x6 airport crash tender

NASA-USAF Oshkosh T-3000 4x4 at KSC in Florida

USMC Oshkosh MB1 fire tender

Since 1989, Oshkosh has completed sixteen acquisitions and three divestitures: