Francis Louis Barrallier (1773 – 11 June 1853) was a French-born explorer of Australia.
Barrallier was the son of French naval surveyor. Unusually, despite his French descent he was later employed by the British and came to Australia in April 1800. He was appointed an ensign in the New South Wales Corps by Governor Hunter in July 1800,[1] and was made engineer and artillery officer in August 1801.
His first assignment was to design the Parramatta orphan asylum building.[1] In March 1801 he sailed with Lieutenant James Grant in the Lady Nelson to further explore Bass Strait, and was responsible for the charting of Western Port and other parts of the coast. Barrallier's work on the maps of Jervis Bay, Western Port and some of Bass Strait were recognised by Governor Philip Gidley King, who made him engineer and artillery officer in the Corps.[1]
In June a voyage with Grant was made to the Hunter River, where Barrallier made a survey of Coal Harbour and part of the river.
In October–November 1802 he was directed by Governor King to try to find a way over Blue Mountains to the west of Sydney. He travelled about 140 miles in seven weeks, but had to turn back - at one stage due to unfriendly Aborigines, and later due to a lack of supplies.[1]
He did not succeed in crossing the range. His finishing point was "towards the head of Christy's Creek, about 15 or 16 miles in a direct line southerly from Jenolan Caves".
In the May 1803 he resigned from the New South Wales Corps and left for England. Other examples of his work in Sydney included the design of the fort on Observatory Hill (used as a signal station in the 1950s) and plans for the first vessel built in Sydney.[1]
In 1805 he was appointed a lieutenant in the 90th regiment. In 1806 he was at St Vincent, and in 1809 was present at the capture of the Island of Martinique.
He was made a captain in 1812. He spent some years making a military survey of the Island of Barbados, was present at the capture of Guadaloupe in 1814, and was appointed surveyor-general of the island. Barrallier returned to England in 1819. He died in London on 11 June 1853.