Clarence Kirschman Streit (German pronunciation: [ʃtʀaɪ̯t]; January 21, 1896 – July 6, 1986) was an American journalist who played a prominent role in the Atlanticist and world federalist movements.

This caused him to write Union Now, a book advocating the political integration of the democracies of Western Europe (including their colonies) and the other English-speaking countries at that time (the United States, Canada, Australia, New Zealand, and South Africa).

[6] After the book's publication, Streit founded Federal Union, Inc. (later renamed the Association to Unite the Democracies) to promote his idea.

Seeking what he described as "a man of national stature" to help publicize his efforts, he was able to secure the endorsement of Supreme Court Justice Owen Roberts, who would be a friend and collaborator during the years subsequent.

He was married to Jeanne Defrance of Lille, France, niece of French jurist Fernand Payen, known for defending Marechal Petain in his trial for treason.