- Apr 4 Thaddeus Stevens, US Radical Republican congressional leader (Rep-R-Pennsylvania 1849-53 1859-68), born in Danville, Vermont (d. 1868)
- Apr 12 John George Lambton, British statesman (1st Earl of Durham), born in London, England (d. 1840)
- Apr 23 John Romney Robinson, Irish astronomer and physicist, born in Dublin, Ireland (d. 1882)