Avard Longley Davidson (November 2, 1877 – July 1, 1931) was a lawyer and political figure in Nova Scotia, Canada.
Davidson practised law in Middleton, Nova Scotia, also serving as town solicitor.
He ran unsuccessfully for a seat in the Nova Scotia assembly in 1906 and 1911.
He was named to the Legislative Council of Nova Scotia in 1928 to assist in its abolition.
Davidson died in a collision between an automobile and a train at the age of 53.