Henry Day

Henry Day may refer to:


 * Pea Ridge Day (Henry Clyde Day, 1899–1934), pitcher in Major League Baseball
 * Harry Day (rugby union) (Henry Thomas Day, 1863–1911), Welsh rugby union forward
 * Henry Day (priest) (1865–1951), British priest
 * Henry Noble Day (1808–1890), American philosopher
 * Henry Day (British Army officer), British soldier