Sir Howard Grubb FRS FRAS (28 July 1844 – 16 September 1931) was an Irish optical engineer.

[2] After training to be a civil engineer, Howard joined his father's firm in 1864 and gained the reputation of being a first class producer of telescopes.

Sir Howard was a longtime member of the Royal Dublin Society, serving as Honorary Secretary from 1889 to 1893, and as vice-president from 1893 to 1922.

Grubb was also known for building accurate electrically driven clock drives for equatorial mounted telescopes.

During the First World War, the Grubb factory was in demand for the production of telescopic gun-sights and during this time he was credited with perfecting a periscope design for Royal Navy submarines.