The Novardok Yeshiva was one of the largest and most important yeshiva in pre-World War II Europe, and a force within the Mussar movement. It was the first of hundreds of Mussar yeshivas which were all called Novardok yeshivas.

The yeshiva was established in Novogrudok, Minsk Governorate, Russian Empire in 1896, together with a Kollel for married men, under the direction of Rabbi Yosef Yozel Horwitz, an alumnus of the Kovno Kollel and pupil of Rabbi Yisrael Salanter. He was known as the Alter fun Novardok, "the elder of Novardok" in Yiddish.

Novardok yeshivas were opened in major cities likr Kyiv, Kharkiv, Nizhny Novgorod, Rostov-on-Don, Zhytomyr, Berdychiv, Tsaritsyn (now Volgograd), Saratov, Plogid, and Chernihiv. Influenced by the Alter, his students also created yeshivas in Kherson, Mohyliv-Podilskyi, Kamieniec-Podolski, Berdichev, Nikolaev, Bălţi, Odessa, Piotrków Trybunalski and other places.

Novardok had its own unique outlook, stressing the total negation of ego and the physical world. Through this, the complete and total focus of a person can be on his spiritual and intellectual side. Like other Mussar schools, Novardok demanded the complete shattering of personal desires, eradicating any vestige of evil habits. For that purpose, students would carry notebooks, in which they would daily enter records of failures and achievements. Before bedtime, they would check their "bookkeeping" and make plans-of-action for correcting faults. One method of "breaking" oneself was by denying oneself extra pleasures of this world.

Students of Novardok participated in deliberately humiliating behaviour, such as wearing old, patched clothing, or going to a shop and asking for a product not sold there, such as screws in a bakery. All Novardok students would share their personal belongings with friends to rid themselves of their desires for worldly possessions.

One pupil related that the purpose of these exercises were not to "put yourself down", as is commonly thought. The training, in fact, promoted the opposite; it gave the students the emotional freedom from the chains of public approval. They discovered that the fear of embarrassment was actually much greater than the reality. This strengthened their confidence to do the right thing, oblivious to what others might think.

An extension of Novardok's unconventional approach entailed the establishment of numerous branches of the yeshiva. The most elite students of the yeshiva would set out on foot to strange communities without money in their pockets, simultaneously abstaining from speech and not asking for a ride or even food. Upon reaching a town, they would enter the Beth Midrash, and without a word to anyone, study Torah.

With this method, Novardok established in Poland alone no less than seventy yeshivas of varying sizes. Dispatched from the yeshiva base in Białystok, teams would investigate towns and cities and evaluate their suitability for a yeshiva. The extensive Novardok network supplied half of all the students to Eastern Europe's other famous yeshivas.