Based on ethnographic fieldwork conducted with Jewish conversion agents and activists in Israel between 2004 and 2007, this article argues that state-run Jewish conversion provides a constructive institutional arena for religious Zionists to rework their active citizenship, in both the Israeli state and the religious Zionism movement. To the extent that Israel offers a compelling case for understanding how and why the politics of religious conversion intersect with the legal and bureaucratic dynamics of the modern nation-state, it also allows us to unpack the identity work of those who take it upon themselves to embody the morals and ambitions of the Jewish state. I draw on anthropological writing on the state and citizenship to argue that, by working institutionally on behalf of the state and investing itself in a goal assumed to secure its future, the religious Zionist community attempts to reaffirm the idea of "national responsibility" -a discursive construct that underwrites its interdependent relationship with the Israeli state. Such a reaffirmation is of particular importance in light of the volatile struggles it has had with and within the state over Israel's political and religious policies. [The nation-state, Citizenship, Religious Conversion, National Responsibility, State Persons, Jewish Conversion, Religious Zionism, Israel]Over the last two decades, Jewish giyyur (conversion) policy in Israel has become popularly identified as a "national mission"-an urgent, Zionist-driven, state-endorsed endeavor. This concept was first formally introduced into the bureaucratic, political, and public discourses on conversion in 2003, when the then prime minister of Israel, Ariel Sharon, used it to frame the conversion of non-Jewish immigrants who had arrived en masse from the former Soviet Union (FSU), naturalizing as Israeli citizens under the expanded repatriation law. Although the involvement of the Israeli state in the conversion of newcomers is not new, it was only in the wake of extensive waves of non-Jewish FSU immigration to Israel in the late 1980s and 1990s that this involvement in Jewish conversion took on the scale and meaning of a highly prioritized, proconversion national mission.Interestingly, the vast majority of conversion agents and activists attending to, and speaking in the name of, Israel's conversion national mission are identified as religious Zionists. Within this rubric, they work as civil servants on behalf of the state's policy, while investing themselves in a goal that they believe will benefit Israel as a Jewish and Zionist state. The dominance of religious Zionism in this framework is reflected in the sociological makeup of the government institutions in charge of conversion (i.e., conversion courts, conversion schools, ritual baths, and various government ministries), as well as at the grassroots level: volunteer rabbis and public figures, nonprofit associations, and the host families and communities who support candidates throughout the conversion process.In this article, I draw atte...