| Honorific-Prefix: | Yang Mulia Tengku Sri Mara Raja Tan Sri |
| Tengku Ahmad Rithauddeen Ismail | |
| Office: | Minister of Defence |
| Term Start: | 20 May 1987 |
| Term End: | 26 October 1990 |
| Primeminister: | Mahathir Mohamad |
| Deputy: | Abang Abu Bakar Abang Mustapha |
| Predecessor: | Abdullah Ahmad Badawi |
| Successor: | Najib Razak |
| Constituency: | Kota Bharu |
| Office1: | Minister of Information |
| Monarch1: | Iskandar |
| Term Start1: | 11 August 1986 |
| Term End1: | 20 May 1987 |
| Primeminister1: | Mahathir Mohamad |
| Deputy1: | Railey Jeffrey |
| Predecessor1: | Rais Yatim |
| Successor1: | Mohamed Rahmat |
| Constituency1: | Kota Bharu |
| Monarch2: | Abdul Halim |
| Term Start2: | 5 September 1974 |
| Term End2: | 13 August 1975 |
| Primeminister2: | Abdul Razak Hussein |
| Deputy2: | Shariff Ahmad |
| Predecessor2: | Ghazali Shafie |
| Successor2: | Abdul Taib Mahmud |
| Constituency2: | Kota Bharu |
| Office3: | Minister of Foreign Affairs |
| Monarch3: | Iskandar |
| Term Start3: | 17 July 1984 |
| Term End3: | 10 August 1986 |
| Primeminister3: | Mahathir Mohamad |
| Deputy3: | Abdul Kadir Sheikh Fadzir |
| Predecessor3: | Ghazali Shafie |
| Successor3: | Rais Yatim |
| Constituency3: | Kota Bharu |
| Monarch4: | Abdul Halim Yahya Petra Ahmad Shah |
| Term Start4: | 13 August 1975 |
| Term End4: | 16 July 1981 |
| Primeminister4: | Abdul Razak Hussein |
| Deputy4: | Mokhtar Hashim (1979–1981) |
| Predecessor4: | Abdul Razak Hussein |
| Successor4: | Ghazali Shafie |
| Constituency4: | Kota Bharu |
| Office5: | Minister of Trade and Industry |
| Monarch5: | Ahmad Shah Iskandar |
| Term Start5: | 17 July 1981 |
| Term End5: | 17 July 1984 |
| Primeminister5: | Mahathir Mohamad |
| Deputy5: | Lew Sip Hoon (1981–1983) Shahrir Abdul Samad (1981–1983) Muhyiddin Yassin (1983–1984) Oo Gin Sun (1983–1984) |
| Predecessor5: | Mahathir Mohamad |
| Successor5: | Tengku Razaleigh Hamzah |
| Constituency5: | Kota Bharu (previously Kota Bharu Hilir) |
| Office6: | Member of the Dewan Rakyat for Kota Bharu (previously Kota Bharu Hilir) |
| Term Start6: | 10 May 1969 |
| Term End6: | 20 October 1990 |
| Predecessor6: | Nik Ahmad Kamil Nik Mahmud (UMNO–Alliance) |
| Majority6: | 155 (1969) Unopposed (1974) 8,682 (1978) 7,970 (1982) 5,033 (1986) |
| Successor6: | Ilani Isahak (S46) |
| Birth Date: | 1928 1, df=y |
| Birth Place: | Kelantan, Unfederated Malay States, British Malaya (now Malaysia) |
| Death Place: | Jalan Duta, Kuala Lumpur, Malaysia |
| Resting Place: | Bukit Kiara Muslim Cemetery, Kuala Lumpur |
| Nationality: | Malaysian |
| Party: | United Malays National Organisation |
| Father: | Tengku Ismail Tengku Nik Haji |
| Mother: | Tengku Besar Zabedah |
| Relations: | Raja Perempuan Budriah and Tengku Noor Zakiah (sisters) Sirajuddin of Perlis (nephew) |
| Alma Mater: | University of Nottingham |
| Native Name Lang: | ms-arab |
Tengku Ahmad Rithauddeen bin Tengku Ismail (Malay: تڠکو أحمد رضاءالدين بن تڠکو إسماعيل|label=[[Jawi alphabet|Jawi]]|script=arab|italic=unset; 24 January 1928 – 29 April 2022) was a Malaysian politician and barrister who formerly served as chairman of the UMNO disciplinary board. He previously served as Minister of Defence, Minister of International Trade and Industry and Minister of Foreign Affairs. He was Kota Bharu Member of Parliament for five terms before losing his seat in the 1990 General Election to the Semangat 46 candidate. He was a royal prince of the Kelatan Royal Family and a grandson of the last Sultan of Pattani, Sultan Abdul Kadir Kamarudin Syah. After the throne was overthrown by the Siamese, the Sultan of Pattani was exiled to Kelantan and married Tengku Kembang Petri Binti Sultan Ahmad. He was also among few Malaysians awarded the Grand Cordon of the Order of the Rising Sun from Japanese Emperor, credited with strengthening Malaysian-Japanese relationship.[1] He was also vocal in Malaysian politics, voicing several issues in regards to the post-BN social concerns.[2]
Tengku Ahmad Rithauddeen died on 29 April 2022 at his residence in Jalan Duta, aged 94.[3] He was buried at Bukit Kiara Muslim Cemetery in Kuala Lumpur.[4]
| Constituency | Candidate | Votes | Pct | Opponent(s) | Votes | Pct | Ballots cast | Majority | Turnout | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1969 | P018 Kota Bharu Hilir, Kelantan | (UMNO) | 13,069 | 50.30% | Wan Hashim Wan Ahmad (PMIP) | 12,914 | 49.70% | 26,739 | 155 | 67.73% | ||||
| 1974 | P019 Kota Bharu, Kelantan | Tengku Ahmad Rithauddeen Ismail (UMNO) | Unopposed | |||||||||||
| 1978 | Tengku Ahmad Rithauddeen Ismail (UMNO) | 18,136 | 65.73% | Lah (PAS) | 9,454 | 34.27% | 8,682 | |||||||
| 1982 | Tengku Ahmad Rithauddeen Ismail (UMNO) | 21,424 | 58.26% | Salehudin Abdullah (PAS) | 13,454 | 36.59% | 37,558 | 7,970 | 74.76% | |||||
| Kang Sam Chuan (DAP) | 1,896 | 5.16% | ||||||||||||
| 1986 | Tengku Ahmad Rithauddeen Ismail (UMNO) | 20,310 | 57.07% | Hassan Abdullah (PAS) | 15,277 | 42.93% | 36,282 | 5,033 | 68.96% | |||||
| 1990 | Tengku Ahmad Rithauddeen Ismail (UMNO) | 12,106 | 30.14% | (S46) | 27,566 | 68.61% | 41,254 | 15,460 | 73.35% | |||||
| Saifuddin Daud (IND) | 503 | 1.25% | ||||||||||||