Ahmad Rithauddeen ibn Ismail (born 24 January 1932) is a Malaysian politician and barrister who is currently chairman of the Board of Discipline UMNO.
He was previously Minister of Defense of Malaysia and Minister of Foreign Affairs (1978).
He was Kota Bharu Member of Parliament for five terms before losing in the 1990 General Election to the Semangat 46 candidate.
Tan Sri Rithauddeen is a royal lineage of Kelatan Royal Family and grandson of the late Sultan Patani, Sultan Abdul Kadir Kamarudin Syah.
After the throne was crowned by the Siamese, the Patani Sultan was deported to Kelantan and married Tengku Kembang Petri Binti Sultan Muhammad IV.
He was also among few Malaysians awarded the Grand Cordon of the Order of the Rising Sun from Japanese Emperor, credited in strengthening Malaysian-Japanese relationship.
He was also vocal in Malaysian politics, voicing several issues in regards to the post-BN social concerns.