Gilliatt is a surname. Notable people with the surname include:

• Penelope Gilliatt (1932–1993), English novelist.
• William Gilliatt (1884-1956), British gynaecologist.

• Lagrange, Ohio
• LaGrange Park, Illinois
• La Grange Plantation
• Lagrange point colonization
• Lagrange Point (game)
• La Grange Road (Amtrak station)
• La Grange Road (Metra)
• La Grange Road station
• Lagrange's equation
• Lagrange's formula
• Lagrange's method
• La Grange (song)
• Lagrange's theorem
• Lagrange's theorem (number theory)
• Lagrange's undetermined multiplier
• Lagrange theorem
• Lagrange theorem (group theory)
• Lagrange theorem (number theory)
• Lagrange Township, Bond County, Illinois
• LaGrange Township, Lorain County, Ohio
• LaGrange Township, Ohio
• Lagrangeville
• La Grange (WI)
• Lagrangian and Eulerian specification of the flow field
• Lagrangian Coordinates