"Istanbul (Not Constantinople)" is a 1953 novelty song, with lyrics by Jimmy Kennedy and music by Nat Simon. It was written on the 500th anniversary of the fall of Constantinople to the Ottomans. The lyrics humorously refer to the official renaming of the city of Constantinople to Istanbul. The song's original release, performed by The Four Lads, was certified as a gold record. Numerous cover versions have been recorded over the years, most famously a 1990 rock version by They Might Be Giants.

James Kennedy was an Irish songwriter. He was predominantly a lyricist, putting words to existing music such as "Teddy Bears' Picnic" and "My Prayer" or co-writing with composers like Michael Carr, Wilhelm Grosz and Nat Simon. In a career spanning more than fifty years, he wrote some 2000 songs, of which over 200 became worldwide hits and about 50 are popular music classics.