Nan Blair (September 28, 1891 – August 15, 1944), born Clyte Cosper, was an American screenwriter and literary agent active primarily during Hollywood's silent era.

Blair was born in Dallas, Oregon, to Otis Cosper and Nettie Niece.

Her first husband Joseph Elizalde[1] died in Santa Barbara in 1917, around the time she began writing screenplays in Hollywood.

[3] By 1918, Blair headed up the script-reading department at Triangle Pictures, where she worked on shorts like A Dream of Egypt and A Prince for a Day.

[4] She later headed Palmer Photoplays' manuscript sales department and was affiliated with Zeppo Marx Inc.[5] Her last known credit was on This Is the Life in 1935.