Proselytizing ( /ˈprɒsɨlɨtaɪzɨŋ/) is the act of attempting to convert people to another opinion and, particularly, another religion. The word proselytize is derived ultimately from the Greek language prefix προσ- (toward) and the verb ἔρχομαι (to come) in the form of προσήλυτος (a new comer). Historically in the Koine Greek Septuagint and New Testament, the word proselyte denoted a gentile who was considering conversion to Judaism. Though the word proselytism originally referred to Early Christianity (and earlier Gentiles), it also refers to other religions' attempts to convert people to their beliefs or even any attempt to convert people to another point of view, religious or not.

Many Christians consider it their obligation to follow what is often termed the Great Commission of Jesus, recorded in the final verses of the Gospel of Matthew: "Go ye therefore, and teach all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Ghost: Teaching them to observe all things whatsoever I have commanded you: and, lo, I am with you always, even unto the end of the world. Amen." The Acts of the Apostles and other sources contain several accounts of early Christians following this directive by engaging in individual conversations and mass sermons to spread the "good news". Evangelical Christians often use the term "witnessing" to mean discussing one's faith with another person with the intent of proselytism.

Jean Bethke Elshtain (born 1941) is an American political philosopher.

She is the Laura Spelman Rockefeller Professor of Social and Political Ethics at the University of Chicago Divinity School, and is a contributing editor for The New Republic. She is, in addition, newly the Thomas and Dorothy Leavey Chair in the Foundations of American Freedom at Georgetown University. She is a member of the American Academy of Arts and Sciences and she has served on the Boards of the Institute for Advanced Study, Princeton, and the National Humanities Center. She is the recipient of a Guggenheim Fellowship and has received nine honorary degrees. In 2002, Elshtain received the Frank J. Goodnow award, the highest award for distinguished service to the profession given by the American Political Science Association.

The focus of Elshtain's work is an exploration of the relationship between politics and ethics. Much of her work is concerned with the parallel development of male and female gender roles as they pertain to public and private social participation. Since the September 11, 2001 attacks she has been one of the more visible academic supporters of U.S. military intervention in Afghanistan and Iraq.