According to Official Guinness Records,
The largest pumpkin pie weighs 1,678 kg (3,699 lb) and was made by New Bremen Giant Pumpkin Growers (USA) at New Bremen Pumpkinfest in New Bremen, Ohio, USA, on 25 September 2010. The diameter of the pie was 6 m (20 ft). The crust was made of 440 sheets of dough and the other ingredients were canned pumpkin, evaporated milk, eggs, sugar, salt, cinnamon and pumpkin spice.
For a complete list of 2010 records, please visit 2010 Guinness Records in United States.