Heinrich Nidecker | |
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| Born | 24 September 1894 Illkirch-Graffenstaden, Alsace–Lorraine, German Empire |
| Died | by September 1982 (aged 87) Arlesheim, Canton of Basel, Switzerland |
| Citizenship | Swiss |
| Alma mater | University of Basel |
| Occupation | Librarian |
Heinrich Albert Nidecker (24 September 1894 – 1982), also known as Henri Nidecker, was a Swiss librarian and philologist. Born in Alsace, he completed degrees at the University of Basel, earning a doctorate English philology in 1924. Nidecker spent most of his career as a librarian at the Basel University Library, where he developed a cataloguing system, and was responsible for the departments of English philology and philosophy. Nidecker was involved in the international auxiliary language movement, supporting Ido and later Interlingue; he authored several works in the latter. Nidecker also wrote on topics of social reform, and on the history of music in Switzerland.