An advertising agency agreement is a legal contract between two or more parties, which sets out the terms of their business relationship. I'm thinking about working with a marketing agency.I'm new to this and I want to know what usually goes into a contract with an agency. See how the best agencies write their client contracts and the 11 most important elements to include in a contract agreement. Join Canada's highest award-winning advertising program where you will gain an understanding of the overall industry in your first year. A Creative Digital Marketer, crafting your brand's story, then spreading it around town! Download the free Marketing Agency Agreement template for your business. Dentsu is one of the largest global marketing and advertising agency networks in the world. Dentsu Americas CEO, Michael Komasinski. Well done to entire Smarter Contracts team…