William Frederick Lamb (Brooklyn, 1883 - New York, 1952) was an American architect. He was the principal designer of the Empire State Building. Lamb studied at William College, Columbia University's School of Architecture and the Ecole des Beaux Arts in Paris where he received a diploma in 1911. Also in 1911, Lamb joined the firm of Carrere and Hastings which eventually became Shreve, Lamb and Harmon.