Khatijah Sidek (1918–1982) or Che Khadijah Mohd Sidik was a Malay nationalist and politician during colonial Malaya and the elected leader of the Kaum Ibu (literally meaning "mother's group"; the section name was later changed to Wanita UMNO) in 1954.
She was a key figure in the early history of the United Malay National Organisation (UMNO) and a vocal campaigner of women's rights and the education of girls.
Prior to coming to Malaya, Khatijah was active in Puteri Kesatria, an anti-colonial women's group based in Bukit Tinggi, Sumatra.
In 1953, she joined UMNO's branch in Johor Bahru following an invitation to survey Malay women's condition under British rule.
In her second visit to Singapore in 1947, she wrote in her memoirs that she was determined to help under-educated women by teaching them housekeeping skills and raising their political consciousness.
[13] The Tunku later determined that there was not enough evidence to expel her,[14] and the UMNO Executive later rescinded her expulsion, but not without warning Khatijah to mind her conduct in the future.
[15] After presiding the leadership of KI UMNO at the national level for two years, she was again expelled for challenging the sexual politics of the party.