Elefsis Shipyards is a Greek shipbuilding company, also involved in other industrial constructions. Founded in 1968, it has constructed many types of ships, including the largest bulk carriers built in Greece and military ships. The latter include the Jason-class Tank Landing Ships (LST) developed by Elefsis Shipyards (first launched in 1987), a series of Fast Attack Crafts and the largest ship of the Greek Navy (Support Ship Prometheus on Italian designs).

Its latest constructions include an advanced high-speed ferry type, of which two have been so far delivered (in 2005 and 2007). Other company divisions and activities include ship repair and conversions, and industrial constructions.