A steam fair or (steam rally) is a regular organised gathering of historic steam-powered vehicles and machinery, open to the public. Typical exhibits include: traction engines, steam rollers, steam wagons, and steam cars. Often, the scope is widened to include other historic exhibits such as stationary engines, internal-combustion -powered road transport, agricultural and construction vehicles, working horses, woodcraft and the like.

A typical steam fairs consists of:

The following is a geographic list of these gatherings, some of which are referred to as rallies or as festivals. The list does not include static steam museums unless they host a particular event that falls into the classification.

In addition there are some travelling shows powered by steam. Where these are referred to as steam fairs they are included in the list.