"Once to Every Man and Nation" is a hymn based on a poem by American poet James Russell Lowell, set to the Welsh tune "Ebenezer" composed by Thomas John Williams. The hymn is known for its strong moral message about standing for truth and justice. The original tune, also known as "Tôn y Botel", was composed by Williams for the hymn "Goleu yn y Glyn" (Light in the Valley).