The Law Adviser to the Lord Lieutenant of Ireland was a Law Officer of the English Crown in nineteenth-century Ireland. The office lapsed in the 1880s, due apparently to concerns that it was becoming too political, but was briefly revived in the early twentieth century. It was abolished on the establishment of the Irish Free State in 1922.

Francis Blackburne PC (Ire) KS was an Irish judge and eventually became Lord Chancellor of Ireland.