Major Louis Frederick Knollys, CMG (1847–1922) was the fourth British colonial Inspector-General of Police in Ceylon (Sri Lanka).

Canon William Frederick Ernest Knollys and Caroline Augusta née North.

Knollys enlisted in the 32nd (Cornwall) Regiment of Foot in 1866 and in September 1868 was made a Lieutenant.

In 1876 he commanded an expedition into the mountains of Fiji, where he suppressed an uprising amongst the local tribes,[2] receiving a promotion to captain.

Knollys retired in 1902 and died at Ross-on-Wye, Herefordshire, England on 15 December 1922.