This paper asserts that if a single theme prevails in the story of Greater Boston's new immigration, it is diversity. No single group dominates in metro Boston. Diversity in country of origin is compounded by differences in ethnicity, socioeconomic background, legal status, and language. Issues of particular salience to immigrant communities include linguistic barriers in understanding and communication; cultural differences pitting the practices of the homeland against "American" ones; differences in look, dress or behavior (including religious differences) that might generate suspicion or discriminatory behavior; and the obstacles faced by non-citizens as a result of their legal status. The paper focuses on understanding the new face of Greater Boston (kinds of immigrants, such as undocumented migrants, lawful temporary residents, refugees, asylees, parolees, and lawful permanent residents; and race, ethnicity, national origin, and language); policy actors (federal, state, and local governments, nonprofit service providers and advocacy groups, and foreign governments and consulates); issues facing the region (processing newcomers, tracking aliens, becoming citizens, voting and elections, overcoming linguistic barriers, dealing with discrimination, work and income security, and building coalitions and community); and building a new Boston. (SM)