布西亚半岛（Boothia Peninsula）是加拿大近北极地区的一个半岛，其北端为北美大陆的最北端。其北端为贝洛特海峡。该半岛得名于费利克斯·布思(Felix Booth)的名字，由苏格兰探险家约翰·罗斯于1829年取名，因费利克斯·布思曾赞助罗斯的探险活动。

Boothia Peninsula (/ˈbuːθiə/; formerly Boothia Felix) is a large peninsula in Nunavut's northern Canadian Arctic, south of Somerset Island. The northern part, Murchison Promontory, is the northernmost point of mainland Canada.

Bellot Strait (Ikirahaq) separates the peninsula from Somerset Island to the north. Babbage Bay is on the east coast, as is Abernethy Bay, just to the south. The community of Taloyoak lies in the far south and is its only significant population centre. Paisley Bay is on the west coast, as is Wrottesley Inlet (between Paisley Bay and Bellot Strait).