Rosemary Edna Sinclair (nee Fenton; born 17 November 1936) is an Australian environmental and children's rights activist.
She is involved in administrative approach related to developmental actions.
She won the title of Miss Australia in 1960.
She has held many key posts at Telecom Australia.
In 2002, she was represented on the Broadband Advisory Group of Federal Government and was also a delegate to the United Nations Special Session on Children (New York).
In November 1988, in association with Christine Stewart, she founded the National Association for the Prevention of Child Abuse and Neglect (NAPCAN) to fully address issues related to child abuse.
She also works as the Managing Director of the Australian Telecommunications (ATUG).