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Allophonic rule of vowels prominent in Canada, also found throughout N. American English dialects

Canadian raising (also sometimes known as English diphthong raising) is an allophonic rule of phonology in many varieties of North American English that changes the pronunciation of diphthongs with open vowel starting points. Most commonly, the shift affects /audio=en us eye. ogg//aɪ/ or /audio=en us ow. ogg//aʊ/, or both, when they are pronounced before voiceless consonants (therefore, in words like price and clout, respectively, but not in prize and cloud). In North American English, and usually begin in an open vowel [~], but through raising they shift to , or Canadian English often has raising in words with both /aɪ/ (height, life, psych, type, etc.) and /aʊ/ (clout, house, south, scout, etc. ), while a number of American English varieties (such as Inland North, Western New England, and increasingly more General American accents) have this feature in /aɪ/ but not /aʊ/. It is thought to have originated in Canada in the late 19th century. and in traditional New York City English, /aɪ/ is backed towards except before voiceless consonants, resulting in a distinction based more on frontness, but in Philadelphia it may be more back. The raised variant of /aʊ/ varies by dialect, with more common in Western Canada and a fronted variant commonly heard in Central Canada. In any case, the open vowel component of the diphthongs changes to a mid vowel (, , or ).

As its name implies, Canadian raising is found throughout most of Canada, though the exact phonetic quality of Canadian raising may differ throughout the country. In raised /aʊ/, the first element tends to be farther back in Quebec and the Canadian Prairies and Maritimes (particularly in Alberta): thus, The first element tends to be the farthest forward in eastern and southern Ontario: thus, Newfoundland English is the Canadian dialect that participates least in any conditioned Canadian raising, while Vancouver English may lack the raising of /aɪ/ in particular.

Canadian raising is not restricted to Canada. Raising of both /aɪ/ and /aʊ/ is common in eastern New England, for example in some Boston accents (the former more likely than the latter), as well as in the Upper Midwest. South Atlantic English, New Orleans English, and the accents of England's Fens feature it as well. Raising of just /aɪ/ is found in a much greater number of dialects in the United States; some researchers have begun to refer to raising of /aɪ/ without raising of /aʊ/ as American Raising. This phenomenon is most consistently found in the Inland North, the Upper Midwest, New England, New York City, and the mid Atlantic areas of Pennsylvania (including Philadelphia), Maryland, and Delaware, as well as in Virginia. It is somewhat less common in the lower Midwest, the West, and the South. However, there is considerable variation in the raising of /aɪ/, and it can be found inconsistently throughout the United States. The raising of /aɪ/ is also present in Ulster English, spoken in the northern region of the island of Ireland, in which /aɪ/ is split between the sound (before voiced consonants or in final position) and the sound (before voiceless consonants but also sometimes in any position); phonologist Raymond Hickey has described this Ulster raising as "embryonically the situation" for Canadian raising.