Musa Bin Haji Aman is a Malaysian politician who served as the 14th Chief Minister, State Minister of Finance from March 2003 to May 2018, Member of the Sabah State Legislative Assembly (MLA) for Sungai Sibuga from February 1994 to September 2020, the former State Chairman of Barisan Nasional (BN) and United Malays National Organisation (UMNO) of Sabah. In April 2023, He become the direct member of Gabungan Rakyat Sabah (GRS). He is the longest-serving Chief Minister of Sabah by holding the position for 15 years and is the older half brother of Anifah Aman, the Special Advisor to the Chief Minister of Sabah on International Relations and Foreign Investments, President of Love Sabah Party (PCS) and former Minister of Foreign Affairs.

The chief minister of Sabah is the head of government of Sabah, Malaysia. Since September 2020, the position has been held by Hajiji Noor from the Parti Gagasan Rakyat Sabah from the coalition of Gabungan Rakyat Sabah (GRS) which had won the 2020 Sabah state election. As in other parts of the Malaysian federation, the Westminster Parliamentary system is adopted, whereby, the leader of the party with the most seats in the state legislature would usually become the chief minister of Sabah. In other words, it is the person commanding the support of the state legislature. The chief minister is appointed by the head of state known as the Yang di-Pertua Negeri. In comparison to other states in Malaysia, the office of the chief minister of Sabah has been held by a more diverse group of people in terms of ethnicity and religion. The post has been held by Kadazan-Dusuns, Bajaus, Malays, Chinese, Muruts, Rungus, Sungai, Idaans, and other persons of mixed heritage as well as being Muslims, Buddhists and Christians.