Mustafa Fahir Yeniçay (19021988) was a Turkish physicist and academic, known for his contributions to atomic and nuclear physics in Turkey. He was also an educator and served at various positions in Turkish academia, including the deanship of the Faculty of Science at Istanbul University.
He received the TÜBİTAK Service Award in 1972, and was nominated for the Nobel Prize in Physics in 1969 for his contributions to the field.