The olive ridley sea turtle (Lepidochelys olivacea), also known as the Pacific ridley sea turtle, is the smallest and most abundant of all sea turtles found in the world; this species of sea turtle is found in warm and tropical waters, primarily in the Pacific and Indian Oceans. They can also be found in the warm waters of the Atlantic Ocean.

These turtles, along with the related Kemps ridley turtle, are best known for their unique mass nesting called arribada, where thousands of females come together on the same beach to lay eggs.