The Haredi dialect () is a vernacular spoken by Haredi communities in Israel. It evolved from "standard" pre-World War II varieties of Yiddish under the impact of the modern Hebrew, in particular of its phonology and lexicon. A great variability is observed in syntax, morphology, phonology, as well as lexicon among the Haredi communities. Their vernacular is preserved and evolved due to their unique conservative isolated way of life, with separate educational and public institutions. Most communities permit code switching between Haredi dialect and Hebrew, while some anti-Zionist Haredim reject Israeli Hebrew altogether.[
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Dalit Assouline of the University of Haifa did an extensive field study of Israeli Yiddish-speaking ultra-Orthodox communities, summarized in her monograph, Contact and Ideology in a Multilingual Community. She distinguishes several strains of Israeli Haredi Yiddish, in particular, Hasidic Yiddish (), coming from central Yiddish dialects spoken by Polish and Hungarian Jews, and Jerusalemite Yiddish also called Litvish, coming from Northern Yiddish spoken by Litvaks (Lithuanian Jews). The strains of Haredi Yiddish derived from the other major group, the southeastern Yiddish, has a much smaller and diminishing representation, while the Hasidic Yiddish being the prevalent one.[Dalit Assouline, Notes on terminology and pronunciation, In: Contact and Ideology in a Multilingual Community: Yiddish and Hebrew Among the Ultra-Orthodox]
The lexicon includes components of Yiddish, modern Hebrew, as well as Aramaic.[Rivka Sorek, "אתם אוחזים?": הכירו את לקסיקון הסלנג החרדי, January 6, 2025]
The term "Hasidic Yiddish" is also applicable to Hasidic communities elsewhere, e.g., in the United States.
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