The son of actor and comedian Charles Dalton, he toured England, Scotland and Ireland with his father's company. He was educated in London, and joined the Irish civil service in Dublin in 1916, but left two years later to study art. In the early 1920s he drew cartoons for Dublin Opinion, but gave that up to join Victor O'Donovan Power's Irish Players, with whom he toured the Irish provinces.
He wrote two novels, Death is So Fair (1936), about the extremism that followed the execution of the leaders of the 1916 rising, and Rags and Sticks (1938), and formed his own theatre company, performing his plays, including The Man in the Cloak (1937), To-Morrow Never Comes (1939), The Spanish Soldier (1940), The Money Doesn't Matter (1941), Lovers Meeting (1941), and They Got What they Wanted (1947, filmed as Talk of a Million in 1951). Three plays were produced posthumously: The Devil a Saint Would Be (1951), This Other Eden (1953, filmed in 1959) and Cafflin' Johnny (1958).
- Robert Hogan, After the Renaissance: a critical history of the Irish drama since The Plough and the Stars, 1967, pp. 45-48
- Patrick Maume, "D'Alton, Louis", Dictionary of Irish Biography, (Eds.) James Mcguire, James Quinn, Cambridge University Press, 2009