HDMS Olfert Fischer (F355) was a Niels Juel-class corvette of the Kongelige Danske Marine. The vessel was laid down in December 1978 and commissioned in October 1981. The corvette operated in the Persian Gulf on two occasions, first in 1990 and 1991 as part of the multinational fleet enforcing the United Nations sanctions against Iraq, then again in 2003 in support of the United States-led invasion of Iraq. Olfert Fischer was deployed as part of the NATO Standing Naval Force Atlantic on at least four occasions during her career.

The Niels Juel class was a three-ship class of corvettes formerly in service with the Royal Danish Navy. They were built in Denmark at Aalborg Shipyard and were launched in the period 1978–1980. In 1998–2000 the three vessels had a mid-life update, as well as a large update on the electrical systems.