This article examines the legal protection of consumers from vendor bidding on New Zealand online auctions sites. The current lack of legal control over online vendor bidding is contrasted with the more restrictive legal position taken in respect of vendor bidding in traditional auctions. The article argues that online vendor bidding is misleading in nature and harmful to consumers. It argues that the law is justified in intervening in order to prevent or discourage the practice. Suggestions are made for a multilayered legal approach to the problem. Copyright Springer Science+Business Media, LLC 2007Protecting consumers, Vendor bidding, Online auctions, New Zealand,