William Henry Comstock (August 1, 1830 – March 9, 1919) was an American/Canadian businessman and politician.

He started his business in 1854, William H. Comstock Company, Ltd., which sold patent medicine including Dr. Morse's Indian Root Pills, Dead Shot Pellets and McKenzus Dead Shot Worm Candy.

[2][3] Comstock was a town councillor and mayor of Brockville, Ontario.

He twice ran unsuccessfully as the Liberal candidate for the House of Commons of Canada for the riding of Brockville in the 1882 and 1887 elections, before being elected in an 1899 by-election resulting from the death of the sitting MP, John Fisher Wood.

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