BZ and ByzZ) is a Byzantine studies journal established in 1892 by Karl Krumbacher.

[1] After Krumbacher's death it was edited by Paul Marc (1909–1927) and August Heisenberg (1910–1930), followed by Franz Dölger (1928–1963), Hans-Georg Beck (1964–1977), Friedrich Wilhelm Deichmann (1964–1980) and Herbert Hunger (1964–1980), Armin Hohlweg (1978–1990), Peter Schreiner (1991–2004), and since 2004 by Albrecht Berger.

Its editorial board is currently located in the Institut für Byzantinistik, Neogräzistik und Byzantinische Kunstgeschichte of the Munich Ludwig-Maximilians-Universität.

The journal is published quarterly,[1] divided into three sections: essays, reviews, and bibliographical notices, announcements and obituaries.

Its themes range from philology over historical and religious studies to archaeology and art history.