Don Stanley Ernest Perera Rajapakse Senanayake (23 August 1917 – 18 December 1989) was the 18th Inspector General of the Sri Lanka Police (IGP) (1970–1978).

Senanayake succeeded Sydney de Zoysa, in 1955, as the Director of the Police Training School, Kalutara.

The senior police officers, who were predominantly Christian, fearing a calamity, met to consider their options.

[3] Senanayake found himself drawn into the coup d’état attempt in January 1962, where a number of the key senior military and policy officers planned to topple the government.

The Judges of the Trial at Bar who heard the coup case, however exonerated him, observing in their judgment: In September 1970 Senanayake was appointed as the Inspector General of Police by Prime Minister Sirimavo Bandaranaike when she won her second term.