François Thijssen or Frans Thijsz (died 13 October 1638?) was a Dutch explorer who explored the southern coast of Australia.
He was the captain of the ship ‘t Gulden Zeepaerdt (The Golden Seahorse) when sailing from Cape of Good Hope to Batavia.
On this voyage, he ended up too far to the south and on 26 January 1627 he came upon the coast of Australia, near Cape Leeuwin.Thijssen continued to sail eastwards, mapping more than 1500 kilometres of Australia’s coast.
He called the land ‘t Land van Pieter Nuyts (The Land of Pieter Nuyts).
Part of Thijssen’s map shows the islands St Francis and St Peter, now known collectively with their respective groups as the Nuyts Archipelago.
The ship, which had been built in Middelburg and left Zeeland on 22 May 1626, finally arrived in Batavia on 10 April 1627.
Thijssen’s observations were included as soon as 1628 by the VOC cartographer Hessel Gerritsz in a chart of the Indies and New Holland.
This voyage defined most of the southern coast of Australia and discouraged the notion that “New Holland”, as it was then known, was linked to Antarctica.