The Commander-in-Chief, Coast of Ireland was both an admiral's post and a naval formation of the Royal Navy.

[1] The French Revolutionary Wars led to Cobh, then usually known as Ballyvoloon or The Cove of Cork, being developed as a British naval port, and assigned an admiral.

In 1917, Bayly, promoted to admiral and given the title Commander-in-Chief, Coast of Ireland, was given command of a mixed British-American force defending the Western Approaches.

[6] The post became "Commander in Chief, Western Approaches" in 1919, and was disestablished at the end of the Irish War of Independence in 1922.

[2] After Ireland's independence, the Royal Navy presence generally consisted of two destroyers, with one usually anchored in the Cobh roadstead, opposite Haulbowline, and another either on roving patrol, or moored at Berehaven.