- Apr 10 "Big Ben", a 13.76 tonne bell, is recast at the Whitechapel Bell Foundry
- Apr 12 1st US billiards championship, Michael J Phelan wins in Detroit
- Apr 15 Battle of Azimghur, Mexicans defeat Spanish loyalists
- Apr 16 The Wernerian Natural History Society, a former Scottish learned society, is wound up