Der Judenstaat (German, literally The State of the Jews, commonly rendered as The Jewish State) is a pamphlet written by Theodor Herzl and published in February 1896 in Leipzig and Vienna by M. Breitenstein's Verlags-Buchhandlung. It is subtitled with "Versuch einer modernen Lösung der Judenfrage" ("Proposal of a modern solution for the Jewish question") and was originally called "Address to the Rothschilds", referring to the Rothschild family banking dynasty, as Herzl planned to deliver it as a speech to the Rothschild family. Baron Edmond de Rothschild rejected Herzl's plan, feeling that it threatened Jews in the Diaspora. He also thought it would put his own settlements at risk.

It is considered one of the most important texts of modern Zionism. As expressed in this book, Herzl envisioned the founding of a future independent Jewish state during the 20th century. He argued that the best way to avoid antisemitism in Europe was to create this independent Jewish state. The book encouraged Jews to purchase land in Palestine, although the possibility of a Jewish state in Argentina is also considered.

Herzl popularized the term "Zionism", which was coined by Nathan Birnbaum. The nationalist movement culminated in the birth of the State of Israel in 1948, but Zionism continues to be connected with political support of Israel.