Ministry of Internal Security (Malay: Kementerian Keselamatan Dalam Negeri), abbreviated KKDN, was a Malaysian federal government ministry.

Ministry of Internal Security was led by the former Prime Minister of Malaysia, Tun Abdullah Ahmad Badawi and was supported by two Deputy Ministers.

Secretary-General (Sec-Gen) KKDN who was aided by two Deputy Secretaries General (Sec-Gen), was responsible for five respective parts presided by a Secretary Part.

This department had four departments / agency: On 18 March 2008, a new cabinet was announced and the Ministry of Internal Security was again incorporated into the Ministry of Home Affairs.

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