Holy, Holy, Holy! is a Christian hymn written by Reginald Heber (1783 -- 1826). Its lyrics speak specifically of the Holy Trinity, having been written for use on Trinity Sunday. It quotes the Sanctus of the Latin Mass, which translated into English begins Holy, Holy, Holy! Lord God of Hosts. The text also paraphrases Isaiah 6: 3 and Revelation 4: 1 -- 11. John Bacchus Dykes composed the tune Nicaea for this hymn in 1861. The tune name is a tribute to the First Council of Nicaea which formalized the doctrine of the Trinity in 325.\n\nAnswer this question: who wrote the song holy holy holy lord god almighty
Let's be accurate as possible and think first.
Reginald Heber
The relevant information is: "Holy, Holy, Holy!" is a Christian hymn written by Reginald Heber (1783 -- 1826).

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So, the final answer is Reginald Heber