Peter Wiernik (March 6, 1865 – February 12, 1936) was a Russian-born Jewish American Yiddish journalist, newspaper editor, writer and historian.
He immigrated to America in 1885, settling in Chicago and spending the next few years peddling goods and working in a lumberyard and as a laborer on the docks.
When Zolotkof founded Teglekher Yudisher Kuryer (Daily Jewish Courier) in 1887, Wiernik became a silent partner and typesetter for the paper.
He also edited the Chicago papers Vokhntlekher Kuryer (Weekly Courier), Kol (Voice), and Keren Haor (Power of the Light).
While in Chicago, he was founder and chairman of the "Society of People from Vilna", "Exponents of Hebrew Literature", and the educational group "Self-Education Club".
In 1901, when Jacob Saphirstein founded the Jewish Morning Journal, Wiernik became its chief editorial writer.
He also edited the weekly Der Amerikaner (Jewish American) at one point, which was published by the Morning Journal.
The honorary pallbearers included Der Tog editor Dr. Samuel Margoshes, Alexander Kahn of the Joint Distribution Committee, and Yeshiva University president Dr. Bernard Revel.