Sultanah Bahiyah binti Almarhum Tuanku Abdul Rahman (24 August 1930 – 26 August 2003) was the Sultanah of Kedah (1959–2003) and served as the fifth Raja Permaisuri Agong of Malaysia from 21 September 1970 until 20 September 1975.

Tunku Bahiyah was born on 24 August 1930 in Seri Menanti, Negeri Sembilan. She was the eldest daughter of Tuanku Abdul Rahman ibni Almarhum Tuanku Muhammad and Tunku Kurshiah binti Almarhum Tunku Besar Burhanuddin, the Yang di-Pertuan Besar and the Tunku Ampuan Besar of Negeri Sembilan, who were then elected the first Yang di-Pertuan Agong and Raja Permaisuri Agong of Malaysia.

She received her education at a Malay School in Seri Menanti and the Seremban Convent School. She later furthered her studies in United Kingdom and received a degree in Social Science from University of Nottingham.

Tunku Bahiyah married Tuanku Al-Mutassimu Billahi Muhibbudin Sultan Abdul Halim Al-Muadzam Shah ibni Almarhum Sultan Badlishah of Kedah in 1956.

The royal couple had three daughters; two of whom are twins. They are Dato’ Seri Tunku Intan Shafinaz, Dato’ Seri Tunku Soraya and Tunku Sarina (died on 31 August 1991).

In 1958, Tuanku Abdul Halim became Sultan of Kedah. Tunku Bahiyah was installed the Sultanah of Kedah with his ascension to the throne.

From 1970, she served her five-year term as Raja Permaisuri Agong or Queen of Malaysia when Tuanku Abdul Halim became the fifth Yang di-Pertuan Agong.

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