Over the past two centuries, migrations and other historical events have led to major changes in the linguistic profile of Jewish communities around the world. Yiddish is thriving in Hasidic communities, even as its use is diminishing elsewhere. Several longstanding Jewish language varieties have become endangered, as they are spoken primarily by older people, including Ladino, Judeo-Arabic, Jewish Neo-Aramaic (Iraq-Iran), and Jewish Malayalam (Southern India). At the same time, Jews are engaging with these languages in post-vernacular ways, such as through song and food, and new Jewish language varieties are developing, including Jewish English, Jewish Latin American Spanish, and Jewish Russian. This talk explains these developments and makes the case for the urgent need for documentation and reclamation.