Port Edgar is a marina on the southern shore of the Firth of Forth, immediately west of the Forth Road Bridge and the town of South Queensferry, in West Lothian. Originally a naval base, HMS Lochinvar, Port Edgar is now a busy marina with a sailing school and 300 berths. The Edgar commemorated in the name is Edgar Aetheling, the brother of Queen Margaret .
Previously operated by Edinburgh Leisure, Port Edgar Marina Limited - a private investment company - took over management of the marina in April 2014. Part of the group's £1.5m development plans included a capital dredging project to alleviate concerns about harbour depth. Until then the failure of successive management structures to maintain harbour depths through dredging since the departure of the Royal Navy threatened activity at Port Edgar.