Yusof bin Ishak (12 August 1910 – 23 November 1970) was an eminent Singaporean politician and the first President of Singapore. His portrait appears on the Singapore Portrait Series currency notes introduced in 1999.
Yusof was well known both as a journalist and the founder of the Malay newspaper Utusan Melayu prior to becoming head of state of Singapore. He was married to Noor Aishah.
He first served as Yang di-Pertuan Negara (head of state) between 1959 and 1965, remaining in office during the time that Singapore was part of the Federation of Malaysia between 1963 and 1965. Following Singapore's departure from Malaysia in 1965, he served as the first President of the Republic until his death in 1970.