Joshua Henry Mackenzie, Lord Mackenzie
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The Hon. Joshua Henry Mackenzie, Lord Mackenzie (1774–1851) was a 19th-century Scottish lawyer who rose to be a Senator of the College of Justice.

He was born in 1774 the eldest son of the Edinburgh author Henry Mackenzie and his wife, Penuel Grant. His maternal grandfather was Sir Ludovic Grant. He was named after his paternal grandfather, Dr Joshua Mackenzie. The family lived at Cowgatehead just off the Grassmarket in Edinburgh.