Eskinazis, Isak de (b. September 6, 1909, Edirne – d. December 13, 2001, Istanbul), accountant and financier who worked with the Koç Group companies between 1935 and 1986. From 1969 to 1986, he was a member of the Vehbi Koç Foundation (VKV) Board of Directors representing Koç Holding.
Eskinazis completed his elementary and secondary education in Edirne and began his professional career at Osmanlı Bankası. While working at the bank’s branch in Ankara, he was appointed assistant manager for the Çorum branch. As he preferred to stay in Ankara, he contacted Vehbi Koç and as a result, on February 1, 1935, began working at Koçzade Ahmet Vehbi Firması as an accountancy clerk. He later became accounting manager at Koç Ticaret AŞ. He was a founding partner of Koç Holding when it was inaugurated in 1963. As a member of the board of directors and head of the Finance Group, he played a leading role in the financial consolidation of the holding. In 1970, he became a member of the executive committee. He became a member of the VKV Board of Directors in 1969 and remained in the post until 1986, when he retired from the Koç Holding Board of Directors.