Lambton was the fifth son of George Lambton, 2nd Earl of Durham. He was educated at Eton College and Cambridge University. He was married to Cicely Horner. Their younger son, Edward "Teddy" Lambton (1918-83), was also a racehorse trainer.
As an amateur jockey he won the Grand Steeple-Chase de Paris on Parasang in 1888. After a fall at Sandown Park Racecourse in 1892 he decided to take up training and in 1893 he was appointed trainer to the 16th Earl of Derby at Bedford Lodge stables in Newmarket, Suffolk. He trained Canterbury Pilgrim to win the 1896 Epsom Oaks for Lord Derby and the 1906 Epsom Oaks with Keystone II.
Lord Derby died in 1908 and was succeeded by his son, the 17th Earl of Derby. George Lambton trained the winners of ten British Classic Races for the Earl including the Epsom Derby with Sansovino in 1924 and Hyperion in 1933. He also trained the 1,000 Guineas winner Diadem for Lord d'Abernon in 1917.
In 1926 Lambton was replaced by Frank Butters as Lord Derby's trainer but remained as his racing manager and resumed training for the Earl in 1931. In 1933 however he was finally replaced by Colledge Leader. He became a public trainer and remained one until his death in 1945.
British Classic Race wins
- 1,000 Guineas - (4) - Canyon (1916), Diadem (1917), Ferry (1918), Tranquil (1923)
- Oaks - (2) - Canterbury Pilgrim (1896), Keystone II (1906)
- St. Leger - (4) - Swynford (1910), Keysoe (1919), Tranquil (1923), Hyperion (1933)
- George Lambton in the National Portrait Gallery (London).
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