Richard John Uniacke (June 6, 1789 – February 21, 1834) was a lawyer, judge and political figure in Nova Scotia. He represented Cape Breton County in the Nova Scotia House of Assembly from 1820 to 1830.
He was born in Halifax, Nova Scotia, the son of Richard John Uniacke and Martha Maria Delesdernier who was the daughter of Moses Delesdernier. He was educated at King's College in Windsor, went on to study law and was called to the bar in 1810. Uniacke went to Cape Breton Island, then a separate colony, in 1813. He was named to the Executive Council and became acting attorney general. From 1815 to 1816, he served as the island's acting chief justice. He resigned his appointments in Cape Breton and returned to Halifax where he became advocate general of the vice admiralty court in 1819, succeeding his father.