Osias Tager (21 June 1914 – 26 March 2005) was a British businessman who was one of the founders of the Ravenswood community, a residential community for adults with learning difficulties.

Tager was born in Hannover, German Empire. He married Minnie who died from cancer in 1974 aged 54.^[1] Tager and Minnie had children Romie, Helen, Sharon, and Henry.^[2]

In 1953,^[3] Tager was one of the founders of the Jewish Association for Mentally Handicapped Children, now the Ravenswood Foundation, a residential community in Berkshire run by the charity Norwood that provides a home for adults with learning difficulties. Tager's daughter Sharon lives at Ravenswood and his son Henry also lived there until his death in 2004.^[2][4] In 2006, Romie and Esther Tager gave the centre £1m in memory of Romie's father.^[5]