A training field is a type of outdoor training facility typically used by a military, paramilitary, or militia to train or organize soldiers and recruits. Training fields were common until after World War II, when the need for mass training of troops was reduced, and military training and organization moved to dedicated, permanent training facilities.
The term "training field" may also refer to outdoor training facilities used for sports that are often played in fields, such as track and field and association football, though these are more specifically called training camps and training grounds.