Holy, Holy, Holy! Lord God Almighty

"Holy, Holy, Holy! Lord God Almighty!" is a Christian hymn written by the Anglican bishop Reginald Heber (1783–1826).

Written during the author's time as vicar in Hodnet, Shropshire, England, the text was first published posthumously in 1826. It was set to the tune "Nicaea," by John Bacchus Dykes, in the influential Hymns Ancient and Modern. It remains one of Heber's most popular compositions, enduring into the 21st century in many Christian traditions.

Intended for use on Trinity Sunday, the text invites worshippers to join in praising the trinitarian deity, paraphrasing Revelation 4:1–11.