Otti Roethof (born ca. 1950)[2] is a former Dutch karateka.
Roethof was born on Curaçao and moved with his family to Suriname at the age of 10.[3] In the early 70s he moved to the Netherlands, where he lived in Amsterdam. Between 1977 and 1984 he won multiple Karate medals at the European and World Karate Championships.[4] In 1977 in Tokyo he became the first non-Japanese world champion.[5] In 1984 he published the book Karate: een handboek voor trainer, coach en karateka . In 1985 he became coach of the Dutch national karate team. At his last world championships in 1986 he comes in fourth.[6]
Roethof ran several sport schools and owned a sports retail shop in the 1990s.