Naval Amphibious Training Base Solomons also called Naval Amphibious Training Base Solomons Island was a US Amphibious Training Base at Solomons, Maryland, on the Dowell Peninsula, from 1942 to 1945 built to train troops for World War II amphibious warfare.

Naval Amphibious Training Base Solomons was the United States's first official naval amphibious training base. It was established in August 1942 on the Patuxent River, called: USNATB, United States Navy Amphibious Training Base. The base closed April 1945, after training 67,698 troops.

Due to the urgent demand for Amphibious Training, Naval Amphibious Training Base Solomons was founded as a temporary base. On July 22, 1944, had its maximum population of 10,150 troops on the base staff and amphibious landing training troops. The base had its own power station, water system, barracks, mess halls, motor pool, and other facilities. On-ship training took place in Chesapeake Bay. Many of the troops completed their basic training at nearby United States Naval Training Center Bainbridge. The first 3,300 Troops arrived at the base in July 1942 for an eight-week training program.

A Naval Combat Demolition Unit (NCDU) was started on May 14, 1943, at the Solomons base. The first team was made up of six officers and 18 enlisted troops trained at the base. Each NCDU were volunteers, training for the Allied invasion of Sicily, called Operation Husky. In addition to Amphibious Training, for the war effort the US Navy had other operations and training at the base including: Naval mine Warfare Test Station (NMWTS), Mine Warfare Experimental Station, and Naval Dispensary for the Training Base.

The site of the Naval Amphibious Training Base Solomons is now Calvert Marina. In 1945, at the closure of Naval Amphibious Training Base Solomons, the land was given to the state of Maryland and used for Maryland Marine Police for Tidewater Fisheries Enforcement Patrols. In 1959 the US sold the land to a private yacht club and marina. In 1981 the land was sold again. Some of the Naval Amphibious Training Base Solomons 17 buildings have been converted for other uses. Across the Patuxent River from Naval Amphibious Training Base Solomons is Naval Air Station Patuxent River.

While the Naval Amphibious Training Base Solomons closed in 1945, the Naval Mine Warfare Test Station (NMWTS) and Mine Warfare Experimental Station continued to operate at what was known as the 295-acre Naval Solomons Annex under the Naval Ordnance Laboratory (NOL). At the site the Naval Ordnance Laboratory Test Facility (NOLTF) was founded in 1947 and operated till 1950. The NOLTF worked on high and low-altitude aircraft drops for testing and training of mine drops, training and testing of torpedo firing in the river, and with naval mines. By 1958, torpedo firing had ended and missile assembly was added to the Test Facility.

In 1948, the Bureau of Yards and Docks opened the Naval Civil Engineering Laboratory (NCEL), which worked on amphibious equipment at the Annex. In 1967 facility activities started to close and in 1971 site became a Naval Recreation Center Solomons (NRC) under Naval District Washington (NDW), and administered by Naval Air Station Patuxent River. Naval Recreation Center Solomons is open to Active Duty Military and Reservist Military in active standing including spouses and dependents. Naval Recreation Center Solomons had cabins, store, camping, fishing, adventure zone, boat rental, pool and beaches.

The United States amphibious operations dates back to the early dates of the nation. On March 3, 1776, the Continental Marines made their first amphibious landing in the Battle of Nassau on to the beaches of the Bahamas. Amphibious operations took place in the American Civil War, Spanish–American War, and World War I. Large-scale amphibious training bases were established during World War II.