威斯特摩兰（Westmorland，在过去也拼写为Westmoreland，更早之前曾拼写为Westmerland和Westmereland）是英国的一个地区，位于西北英格兰，是英格兰的39个历史上的郡之一。在1889年至1974年之间，威斯特摩兰曾经是一个正式的行政区划。之后威斯特摩兰被并入新设立的坎布里亚郡。

Westmorland (/ˈwɛstmərlənd/; formerly also spelt Westmoreland; even older spellings are Westmerland and Westmereland) is an area of North West England and one of the 39 historic counties of England. It formed an administrative county from 1889 to 1974, after which the whole county was administered by the new administrative county of Cumbria. In 2013, Secretary of State for Communities and Local Government Eric Pickles formally recognised and acknowledged the continued existence of England's 39 historic counties, including Westmorland.