Jure Šterk (6 January 1937 – January 2009) was a Slovenian long-distance sailor, member of the Ocean Cruising Club, circumnavigator and author who disappeared during a sailing trip around the world and is presumed dead.

He grew up in Vinica in White Carniola and attended a high school in Črnomelj.

In December 2007, at age 70, Šterk left Tauranga in New Zealand to sail around the world on his boat Lunatic.

Lunatic was spotted on 26 January, approximately 1,000 nmi (1,900 km) off the coast of Australia.

[1] Three months later, on 30 April 2009, Lunatic was found adrift by the crew of the science research vessel RV Roger Revelle, 500 miles (800 km) south-eastern on position: 32°18′0″S 91°07′0″E / 32.30000°S 91.11667°E / -32.30000; 91.11667.