Sir Alwyn Douglas Crow CBE FInstP (10 May 1894 – 5 February 1965) was a British scientist involved in research into ballistics, projectiles and missiles from 1916 to 1953.
At Fort Halstead he developed the Unrotated Projectile an antiaircraft weapon for the Royal Navy, used in the early period of World War II when the supply of anti-aircraft guns was limited.
His obituary in The Times called him a Rocket Projectile Pioneer.
In World War I he was commissioned in the East Surrey Regiment, was injured in 1916, and Mentioned in Despatches.
In 1934 British received intelligence reports about German developments in rocket weapons, and two years later Crow lead a new research team specializing in the topic.