Georgina Mary Muir Mackenzie, Lady Sebright, Baroness d'Everton (9 September 1834 – 24 January 1874) was a Scottish activist, writer and traveller.

She was the first child of Sir John Muir Mackenzie, 2nd Baronet and Sophia Matilda (born Johnstone) of Delvine in Perthshire.

[5] In 1858, they were arrested as spies in the spa town of Schmocks in the Carpathian Mountains because they had "pan-Slavistic tendencies" (neither of them were then aware of these issues).

[3] Mackenzie was the major contributor and she was the prime author when they published the first edition of their book Travels in the Slavonic Provinces of Turkey-in-Europe in 1867.

She married Sir Charles Sebright who was consul-general of the Ionian Islands and created Baron d'Everton in the Duchy of Lucca.