Witless Bay Ecological Reserve is an ecological preserve close to St. John's, Newfoundland and Labrador, Canada. The Witless Bay Ecological Reserve consists of four islands: Gull Island, Green Island, Great Island, and Pee Pee Island. Immense numbers of birds nest on these islands during the seabird breeding season, roughly from 1 April through 1 September.

The Witless Bay reserve contains North America´s largest Atlantic puffin colony. It is estimated that more than 260,000 pairs of Atlantic puffins nest there during the late spring and summer. The reserve also hosts the world's second-largest colony of Leach's storm-petrels. More than 620,000 pairs of these birds come here to nest every year. Thousands of black-legged kittiwakes and common murres arrive for the nesting season.

A tourism information centre is located in the reserve, by Lower Pond in the town of Witless Bay.

Atlantic Puffins of Witless Bay Ecological Reserve

Great Island Puffins 104 Great Island Puffins 105 Great Island Puffins 101 Great Island Puffins 102 Great Island Puffins 106 Great Island Puffins 107 Great Island Puffins 108 Great Island Puffins 109 Great Island Puffins 110 Great Island Puffins 111 Great Island Puffins 112 Great Island Puffins 113 Great Island Puffins 114 Great Island Puffins 115 Great Island Puffins 116 Great Island Puffins 117 Great Island Puffins 119 Great Island Puffins 120 Great Island Puffins 121 Great Island Puffins 100 Great Island Puffins 103