The Native Administration Act Amendment Act 1941 amended the Aborigines Act Amendment Act 1936, also known as the Native Administration Act 1936. It restricted Aboriginal people living in the north of Western Australia from travelling south of the 20th parallel. The Amendment Act 1941 was repealed by the Native Welfare Act 1963.
The stated purpose of the Native Administration Act Amendment Act 1941 was to 'limit the spread of leprosy' in Western Australia by (s.3) forbidding Aboriginal people living above the 20th parallel to travel south of that boundary, except for transfer to a hospital or other institution (s.3a), to receive specialist medical treatment (s.3b), as required by law (s.3c), or while employed to drive stock (s.3d). 'Leprosy Precaution' permits could be issued to authorize travel south.