Ruşen Eşref Ünaydın (1892–1959) was a Turkish linguist, politician, journalist, diplomat, writer and author.

[2] He was a member of the commission involved in introducing the modern Turkish alphabet.

[4][5] He was appointed ambassador to Albania (1934),[6] Hungary (1939–1943),[7] Italy (1943–1944), the United Kingdom (1944–1945),[8] and Greece (1945–1952).

[9] Ünaydın was a pioneer in Turkish literature and journalism for the interviews he published in 1917 and 1918.

These were hailed as the first modern features appeared in Turkish newspapers, and were later published as a book entitled "Diyorlar Ki" (Thus They Said).