Thousand Island dressing is a salad dressing and condiment based on mayonnaise and can include olive oil, lemon juice, orange juice, paprika, Worcestershire sauce, mustard, vinegar, cream, chili sauce, tomato purée, ketchup, or Tabasco sauce.

It also typically contains finely chopped ingredients, which can include pickles, onions, bell peppers, green olives, hard-boiled egg, parsley, pimento, chives, garlic, or chopped nuts (such as walnuts or chestnuts).