Lef Nosi (born Elefter Nosi; 9 April 1877 – 20 February 1946) was an Albanian publisher, archivist, philologist, folklorist, ethnographer, numismatist, archaeologist and politician. On 28 November 1912, he was as one of the signatories of the Declaration of Independence, representing Elbasan. During the Second World War, Nosi was a leading member of Balli Kombëtar and was chosen as a member of the Albanian High Council.