To Dorothy, a Son is a 1950 comedy play by the British writer Roger MacDougall.

The plot revolves around a complex inheritance in which the American ex-wife of a man tries to prevent his current pregnant wife giving birth before a certain day, in order that she can claim the money.

The original London cast included Richard Attenborough, Sheila Sim, Yolande Donlan and Gwenda Wilson.

A Broadway version at the John Golden Theatre lasted for just 8 performances in 1951.

In 1954 it was made into the film To Dorothy a Son directed by Muriel Box and starring Shelley Winters, John Gregson and Peggy Cummins.