A flag protocol (or flag code) is a set of rules and regulations for the display of flags within a country, including national, subnational, and foreign flags. Generally, flag protocols call for the national flag to be the most prominent flag (i.e., in the position of honor), flown highest and to its own right (the viewer's left) and for the flag to never touch the ground. Enforcement of flag protocols vary by nation, with some countries using flag protocols as recommendations and guidelines, while some countries enforce the violations of flag protocol with civil or criminal penalties.

The following guidelines are generally used between all countries.

Typically the national flag of the country in which it is being displayed is given the position of honor. Following the national flags, flags of sub-federal divisions (such as states or provinces) typically follow and then other flags such as for armed forces or personal flags.

In the case of foreign nations, the host country receives highest precedence, and other national flags are displayed in alphabetical order. This position of highest precedence is at the same height as other national flags; no nation's flag should be displayed higher than that of another nation in times of peace.

The position of honor is centered or to the flag's own right (a viewer's left). When carried in single file (such as for color guard), the flag of honor leads.

When two poles are crossed, the position of honor is the flag that ends on the left side from the point of view of an observer (the pole will therefore end on the right). In a semicircle, the position of honor is the center. If a full circle is used outside an entrance, the position of honor is directly over the entrance. If used to line the walls of a room, the flag should be placed directly opposite the entrance. When placed with a podium or at a place of worship, the flag should hang directly behind or on a pole to the right of the speaker, from the point of view of the flag.

On a vehicle the flag should be put on a window or affixed securely to the front of the chassis, on the nearside of the vehicle, i.e. the one opposite the driver. (In other words, in countries that drive on the right hand side of the road, a flag is on the right of the vehicle.) On a vehicle where a visiting Head of State or Government is sharing a car with the host Head of State or Government, the host's flag takes the nearside position, the guest's flag on the offside.

When flown horizontally, as from a flag pole, the flag should be oriented so that the canton is closest to the top of the pole. If hung against a wall, the canton should be placed in the upper-left corner from the point of view of the observer.