A Notice to Cancel Entire Order is a document sent by a buyer or seller to officially cancel an order that has been placed between the two parties. This notice specifies that all items included in the order are to be cancelled and that neither party is to take any further action regarding the order. It is also known as a cancellation of order letter, a cancellation notice, or a cancellation memo. Types of Notice to Cancel Entire Order include: 1. Buyer's Notice to Cancel Entire Order: this document is sent by the buyer to the seller to cancel the entire order placed by the buyer. 2. Seller's Notice to Cancel Entire Order: this document is sent by the seller to the buyer to cancel the entire order placed by the buyer. 3. Mutual Notice to Cancel Entire Order: this document is sent by both the buyer and seller to cancel the entire order placed by both parties.