Dannenberg Iosif (Joseph) (born 1887, Mitau) — community leader and public figure.

Iosif Dannenberg was honorary secretary of Mitau’s Bikur Cholim (visiting the sick society) and co‑founder of the Mitau Mutual Credit Bank. He served on the International Committee for Aid to Baltic Refugees. After relocating to Riga, he became actively involved in the Trade and Industry Union, holding the position of vice‑chairman of the Supreme Commission for Income and Taxation under the Tax Department. He chaired the Manufacturing Section and led the Collegiate Body on Taxation within the Trade and Industry Union. Dannenberg was also a board member of the Association of Jewish Property Owners and a standing member of the committee of Keren Hayesod. He participated in numerous financial initiatives throughout his career. In 1929, Iosif Dannenberg was awarded the Order of the Three Stars, IV Class.