Conrad IV of Tann (German: Konrad IV. von Tann), also "of Thann" or "of Dahn", (died 1236) was the 48th Bishop of Speyer, holding office from 1233 to 1236.

Conrad came from the von Dahn family who, as episcopal ministeriales, owned estates in the southern Palatinate. The three castles of the Dahn as well as Neudahn Castle were initially all owned by the family.

Conrad of Dahn, brother of the castellan, Frederick I of Dahn, was the cathedral canon in Worms, curator (Domkustos) of St. Cyriakus in Worms-Neuhausen, and provost of the chu

• Hans Ammerich: Das Bistum Speyer und seine Geschichte, Vol. 2: Von der Stauferzeit (1125) bis zum Beginn des 16. Jahrhunderts; Kehl am Rhein, 1999; ISBN 3-927095-44-3. especially pp. 4–6.
• Gatz: Die Bischöfe des Hl. Röm. Reiches 1198-1448, p. 743
• Ludwig Stamer: Kirchengeschichte der Pfalz, Vol. 2; Speyer, 1949
• Sigmund Joseph Zimmern: Artikel Speyer in: Wetzer und Welte’s Kirchenlexikon oder Encyklopädie der katholischen Theologie und ihrer Hülfswissenschaften, Vol. 11; Freiburg: Herder’sche Verlagsbuchhandlung, 1882–1903; col. 596

• Bishop Conrad IV of Tann in the Saarland Biographies Archived 2016-04-13 at the Wayback Machine