Montagu William Douglas CSI, CIE. (1863 – February 1957) was a British soldier and colonial administrator in India.

As the assistant district commissioner in the Punjab, he investigated the attempted murder allegation made by Henry Martyn Clark against Mirza Ghulam Ahmad, the founder of the Ahmadiyya movement.

In February 1884 he joined the 1st Battalion, North Staffordshire Regiment, switching to the Indian army in 1887.

In 1897, having been appointed assistant district commissioner in the Punjab, Douglas was required to investigate the allegations of Henry Martyn Clark against Mirza Ghulam Ahmad.

He wrote to J. D. Shams, an Ahmadiyya missionary in London on 29 July 1939, "... the evidence was false and thus I acquitted Mirza Ghulam Ahmad".

"[6][7]In his book Kitab ul Baryyah (An Account of Exoneration) Mirza Ghulam Ahmad has narrated the details of the case.

[14] According to James S. Shapiro Douglas also believed that "Queen Elizabeth had entrusted Oxford to oversee a propaganda department that would produce patriotic plays and pamphlets".