Trainer may refer to:

• An aircraft trainer is used for training pilots.
• A trainer is a padded sports shoe; the term is used commonly in British English where sneaker (footwear) would be used in American English. The term "trainer" derives from "training shoe".
• An animal trainer trains animals for obedience, tricks and work.
• A horse trainer is responsible for preparing a horse for races.
• A personal trainer guides another person in developing physical fitness.
• A trainer can also be an instructor in a business context.
• A trainer (games) is software for computer and video games that adds in extra options, usually to make the game easier.
• An athletic trainer is one who provides medical assistance to athletes or other physically active individuals. It is improper to refer to an Athletic Trainer as 'Trainer.'
• A bicycle trainer is a device that attaches to a bicycle and makes it stationary for indoor training.
• Trainer (television) - a 1991 British television drama series.

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