Bring a large pot of lightly salted water to a boil. Cook elbow macaroni in the boiling water until cooked through but firm to the bite, 8 minutes; drain. Rinse macaroni with cold water until completely chilled; drain.
Mix macaroni, mayonnaise, crabmeat, celery, chili sauce, lemon juice, dill, salt, and pepper in a bowl. Spoon into lettuce leaves to serve.
