Gather all ingredients.

Bring a large pot of lightly salted water to a boil. Cook macaroni in the boiling water, stirring occasionally until cooked through but firm to the bite, about 8 minutes. Drain.

Rinse macaroni in cold water until cool; drain.

Stir mayonnaise, onion, parsley, mustard, rice vinegar, sugar, celery seed, and salt together in a bowl.

Add macaroni and eggs and stir to coat.

Chill in the refrigerator for 30 minutes before serving. Enjoy!