Werner Tochtermann (30 May 1934 – 7 August 2021) was a German chemist and emeritus professor. From 1976 till his retirement in 1999 he was full professor of Organic Chemistry at the University of Kiel. His main areas of research were the chemistry of medium and large rings, the synthesis of cyclophanes, and the heteroquadricyclane→heteropin rearrangement, e.g. for the synthesis of oxepins from furans (known as Prinzbach–Tochtermann sequence).