Dennis Specialist Vehicles was an English manufacturer of commercial vehicles based in Guildford, building buses, fire engines, lorries (trucks) and municipal vehicles such as dustcarts. All vehicles were made to order to the customer's requirements and more strongly built than mass production equivalents. For most of the 20th century the Dennis company was Guildford's main employer.

Alexander Dennis is a British bus manufacturing company based in Larbert, Scotland. The largest bus and coach manufacturer in the United Kingdom with a 50% market share in 2019, it has manufacturing plants and partnerships in Canada, China, Europe, Hong Kong, Malaysia, New Zealand, Singapore, South Africa and the United States.