Ernest Howard Armstrong, KC (July 27, 1864 – February 15, 1946) was a Canadian politician and journalist who served as the ninth premier of Nova Scotia from 1923 to 1925.

In 1892, he moved to Yarmouth, Nova Scotia where he held the office of vice and deputy United States Consul from 1894 to 1906.

He was elected to the town council in 1900 and was the mayor of Yarmouth from 1904 to 1906, when he won a seat in the Nova Scotia House of Assembly.

In 1923, Armstrong succeeded Murray as Premier and inherited a Liberal government that had been in power for 40 years.

Armstrong was unable to overcome the effects of a serious economic downturn in the region, underestimated the strength of the Maritime Rights Movement and the feelings of alienation among Nova Scotians, and also mishandled labour unrest in Cape Breton, all of which led to the defeat of his government in the 1925 election.