The fourth and last HMS Colossus (R15) had a relatively brief time with the Royal Navy. She was the name-ship of the Colossus-class Light Fleet aircraft carriers, and were basically smaller derivatives of the Illustrious-class carriers. She was launched in 1943 and commissioned in 1944. She served with the British Pacific Fleet from 1945-46, prior to being loaned to France, where she was renamed Arromanches in 1946. While in French service, she participated in the Indo-China conflict in 1948 for three months. She returned to France in 1949 and purchased by them in 1951. The following year, she returned once again to Indo-China, this time as a fully fledged French warship. Between 1958-59 she was reconstructed with a 4 degree angled flight deck.
In 1968 she was converted to an anti-submarine warfare (ASW) carrier, operating up to 24 helicopters. She decommissioned in 1974 after a long and faithful career with the French Navy. She was broken up at Toulon in 1978, a place that had been present to the first Colossus in 1793 and the last in 1978.