Ridehalgh
Ridehalgh or Ridealgh is a surname. People with the surname include:

Arthur Ridehalgh (1907–1971), British lawyer and attorney general of Hong Kong 
George Ridehalgh (1835–1892), English businessman
Judith Constance Mary Ridehalgh, later Judith Hart, British politician
Liam Ridehalgh (born 1991), British footballer
Mabel Ridealgh (1898–1989), British politician

See also
Sagar v Ridehalgh & Sons Ltd, 1931 UK labour law case