By reaching a vote share of 12.6 percent in the 2017 federal election, the Alternative for Germany (AfD) ended Germany’s rare status as a Western European polity lacking a significant Populist Radical Right Party (PRRP). Some of this support comes from a group not usually expected to vote for PRRPs: immigrant-origin voters. Recent survey data shows high levels of support for the AfD especially within the group of Russian-Germans – immigrants from the former Soviet Union and its successor states. What motivates these immigrant-origin voters to support an anti-immigrant party? This article argues that support for the AfD – besides immigration-related preferences – can be best explained by their levels of assimilation or incorporation for different domains regarding the mainstream German society. Especially low levels of economic and social integration, and in particular a strong ethnic identity, relate positively to favouring the German radical right.