| Honorific-Prefix: | Yang Amat Berbahagia Tun |
| Endon Mahmood Ambak | |
| Native Name: | Malay: {{Script|Arab|هند محمود أعماق |
| Birth Date: | 24 December 1940 |
| Birth Place: | Klang, Selangor, British Malaya (now Malaysia) |
| Death Place: | Putrajaya, Malaysia |
| Order: | Spouse of the Prime Minister of Malaysia |
| Term Label: | In role |
| Primeminister: | Abdullah Ahmad Badawi |
| Term Start: | 31 October 2003 |
| Term End: | 20 October 2005 |
| Predecessor: | Siti Hasmah Mohamad Ali |
| Successor: | Jeanne Abdullah |
| Office2: | Spouse of the Deputy Prime Minister of Malaysia |
| Term Label2: | In role |
| Monarch2: | Sirajuddin |
| Term Start2: | 29 January 1999 |
| Term End2: | 31 October 2003 |
| Primeminister2: | Mahathir Mohamad |
| Deputy2: | Tun Abdullah Ahmad Badawi |
| Predecessor2: | Wan Azizah Wan Ismail |
| Successor2: | Rosmah Mansor |
| Spouse: | Tun Abdullah Ahmad Badawi |
| Children: | 2 |
Tun Endon binti Mahmood Ambak (Jawi: هند بنت محمود أعماق ; 24 December 1940 – 20 October 2005) was the first wife of the 5th Prime Minister of Malaysia, Tun Abdullah Ahmad Badawi. She died from breast cancer on 20 October 2005.
Endon was born to Datuk Mahmood Ambak, a Malay man, and Datin Mariam Abdullah, a Japanese woman. Endon had ten other siblings, including her twin sister Noraini as well as other sisters Nonni, Rahmah and Aizah. She was born in Klang, Selangor on 24 December 1940.
Endon's father worked as a mining assistant in the Department of Mines, and subsequently transferred to Perak to help oversee about 60 mines in the district of Kampar. Endon spent much of her childhood days in Kampar and received her early education at the Anglo-Chinese School, now Methodist National Type Primary School. She later went on to attend St Mary's secondary school in Kuala Lumpur.
Endon met Abdullah while she was working at the Federal Establishment Office (now the Public Service Department) in the 1960s and they were married in 1965. Endon later retired from civil service in 1976. Together with Abdullah, Endon had two children: son Datuk Kamaluddin Abdullah, a business tycoon (married to Azrene) and a daughter, Nori Abdullah (married to Khairy Jamaluddin). Both Abdullah and Endon had four grandchildren.
Endon is noted for her contributions to traditional fabric art such as the batik and songket. For example, she launched Campaigns and exhibitions such as the "Batik Extravaganza" which was held in early December 2003 and the Malaysian Batik Movement, "Creation for the World". She was also a patron of the theatre.
Endon underwent a radical mastectomy on 18 April 2002, which was followed by 33 sessions of radiation and a series of physiotherapy sessions at St. John's Medical Center, Los Angeles, California. She discovered she had breast cancer in 2003 while her twin sister Noraini who had earlier been diagnosed with the disease died in January 2003. She left for St. John's Medical Center in Los Angeles, California for treatment, returning again in June 2005 for chemotherapy. She returned to Malaysia on 2 October 2005. She was later brought home to Seri Perdana to be with her family after spending two weeks in Putrajaya Hospital. On 20 October 2005, aged 64, Endon died after a long battle with breast cancer. The funeral was conducted at the Prime Minister's residence and the Putra Mosque (where the funeral prayers are conducted), both in Putrajaya. Endon was buried at the Muslim cemetery in Taman Selatan, Precinct 20, Putrajaya.[1]
Universiti Teknologi Malaysia conferred Endon Mahmood the Honorary Doctorate in Humanities in August 2004.
Endon Mahmoud was conferred the Tun Fatimah Award by the National Council of Women's Organisations on 24 August 2004 for her service to the community. She was posthumously conferred the Seri Setia Mahkota Malaysia (SSM) which carries the title 'Tun' on 6 June 2009 in conjunction with the birthday of the Yang di-Pertuan Agong Tuanku Mizan Zainal Abidin.
Several places and honours were named after her, including: