This thesis examines the effects of mortality salience (MS) on acculturation attitudes of Anglo-Canadians toward culturally close (British) and culturally distant (Arab-Muslim) immigrants. In study 1, the effects of MS on attitudes of Anglo-Canadians were measured using the Host Community Acculturation Scale, based on the Interactive Acculturation Model. MS was hypothesized to result in more welcoming attitudes toward the British and less welcoming attitudes toward Arab-Muslims. However, no support for the hypotheses was found. In study 2, the effects of MS on attitudes of Anglo-Canadians were measured using the receiving society scale accompanying the Relative Acculturation Extended Model. MS was hypothesized to lead to higher separation and lower assimilation held toward British immigrants and higher assimilation and lower separation toward Arab-Muslim immigrants. The hypotheses were supported. The influence of terror management processes on acculturation attitudes is discussed within the context of Canadian society, with additional implications for other societal settings.