Mounted police are police who patrol on horseback or camelback. Their day-to-day function is typically picturesque or ceremonial, but they are also employed in crowd control because of their mobile mass and height advantage and increasingly in the UK for crime prevention and high visibility policing roles. The added height and visibility that the horses give their riders allows officers to observe a wider area, and it also allows people in the wider area to see the officers, which helps deter crime and helps people find officers when they need them. When employed for crowd control, there is a risk that some people may be trampled (resulting in injuries or death). The officer riding the horse may be held legally responsible for injuries depending upon the totality of the circumstances.

Mounted police may be employed for specialized duties ranging from patrol of parks and wilderness areas to riot. For example, in the UK, mounted police are most often seen at football matches. Some mounted police units are trained in search and rescue due to the horse's ability to travel where vehicles cannot.

The French Maréchaussée—direct predecessors of the gendarmerie and the first national police force in a modern sense—were a corps of completely mounted constabulary from their establishment in the early 18th century. Poor roads and extensive rural areas made horse-mounted police a necessity in European states until the early 20th century.

The establishment of organized law-enforcement bodies throughout Africa, Asia and the Americas during the colonial and post-colonial eras made the concept of predominantly horse-police accepted almost world-wide. Notable examples include the Royal Canadian Mounted Police, the Mexican Rurales, the Rhodesian British South Africa Police, the Turkish/Cypriot Zapiteh and the caballeria (mounted branch) of the Spanish Civil Guard.

Tack used by mounted police is similar to standard riding tack, with adaptations for police use. Synthetic saddles are often favored over those made of natural leather to reduce weight, important both because of long riding hours and because police officers must carry numerous articles of personal equipment. High-traction horseshoes made of speciality metals or fitted with rubber soles are typically used in urban areas in place of standard steel horseshoes, which are prone to slip on pavement. Rubber soled shoes also produce less noise than steel shoes and jar the hoof less.

Horses working in riot control wear facial armor, made of perspex so that the animals can still see. The officers themselves are often equipped with especially long wooden or polycarbonate batons for use on horseback, as standard patrol batons would have insufficient length to strike individuals at ground level.

Australia, being a large country and not densely populated, commonly used mounted police in order to traverse the country side. All of the Mounted police units were formed in the 19th century and have continued to this day, excepting Tasmania.

Mounted police units were used in Canada during the 19th century to carry out peace officer duties across vast and sparsely inhabited areas. The predecessors to the Royal Canadian Mounted Police (RCMP), the Royal North-West Mounted Police, relied on using mounted riders from its inception in 1873 to carry out their policing duties across the Prairies. These mounted police were frequently the only government officials in the area.