George John[1] Browne, 3rd Marquess of Sligo (31 January 1820 – 30 August 1896), styled Earl of Altamont until 1845, was an Irish peer.

He married, Like his predecessors, Browne prided himself on being an enlightened landlord.

In the second year of the Great Irish Famine, Browne's tenants gathered at Westport House, the ancestral residence of the Marquesses of Sligo.

Browne assured his tenants of his support for them, and proceeded to hand them guns (without regard for his own safety), enabling them to hunt for game.

He also went into considerable debt in order to acquire cornmeal from the Americas, and converted most of Westport House into a soup kitchen for the starving peasants.