Other salient international design contests:

 

To learn more regarding a particular Competition, follow the relevant link.

Advanced ChallengeAdvertising Graphics ChallengeCartoon ChallengeAppliance Challenge
Arts ChallengeAwards ChallengeWeb ChallengeWebsite Challenge
Black ChallengeBlue Graphics ChallengeBrown Goods ChallengeChair Challenge
Architecture ChallengeCover ChallengeConcept ChallengeDesigner Goods Challenge
Futuristic ChallengeGraphic Arts ChallengeIdea ChallengeAbstract Idea Challenge
Intelligent Idea ChallengeInteraction ChallengeInteractivity ChallengeInterfaces Challenge
Information Technologies ChallengeMedical and Scientific ChallengeMeta Strategy ChallengeRecreation Challenge
Red Arts ChallengeWriting ChallengeSculpture ChallengeStructure Challenge
Social ChallengeSound ChallengeAmateur ChallengeTechnical Challenge
White Appliances ChallengeWriting ChallengeYacht ChallengeYellow Goods Challenge
Moreover check: List of Design Trophy | Competition Index