Outdoor recreation or outdoor activity refers to recreation done outside, most commonly in natural settings. The activities that encompass outdoor recreation vary depending on the physical environment they are being carried out in. These activities can include fishing, hunting, backpacking, walking and horseback riding — and can be completed individually or collectively. Outdoor recreation is a broad concept that encompasses a varying range of activities and landscapes.

Outdoor recreation is typically pursued for purposes of physical exercise, general wellbeing, and spiritual renewal. While a wide variety of outdoor recreational activities can be classified as sports, they do not all demand that a participant be an athlete. Rather, it is the collectivist idea that is at the fore in outdoor recreation, as outdoor recreation does not necessarily encompass the same degree of competitiveness or rivalry that is embodied in sporting matches or championships. Competition generally is less stressed than in organized individual or team sports. When the activity involves exceptional excitement, physical challenge, or risk, it is sometimes referred to as "adventure recreation" or "adventure training", rather than an extreme sport.

Other traditional examples of outdoor recreational activities include hiking, camping, mountaineering, cycling, dog walking, canoeing, caving, kayaking, rafting, rock climbing, running, sailing, skiing, sky diving and surfing. As new pursuits, often hybrids of prior ones, emerge, they gain their own identities, such as coasteering, canyoning, river trekking, fastpacking, and plogging.

In many cities, recreational areas for various outdoor activities are created for the population. These include natural parks, parks, playgrounds, sports facilities but also areas with free sea access such as the beach area of Venice Beach in California, the Promenade des Anglais in Nice or the waterfront of Barcola in Trieste.

Outdoor recreation involves any kind of activity within an outdoor environment. Outdoor recreation can include established sports, and individuals can participate without association with teams, competitions or clubs. Activities include backpacking, canoeing, canyoning, caving, climbing, hiking, hill walking, hunting, kayaking, and rafting. Broader groupings include water sports, snow sports, and horseback riding.

People engage in physical activity outdoors as a form of recreation. Various physical activities can be completed individually or communally. Sports which are mainly played indoors or other settings such as fields are able to transition to an outdoor setting for recreational and non-competitive purposes. Outdoor physical activities can help people learn new skills, test stamina and endurance, and participate in social activities.

Outdoor activities are also frequently used as a setting for education and team building.

Trekking can be understood as an extended walk and involves day hikes, overnight or extended hikes. An example of a day trek is hiking during the day and returning at night to a lodge for a hot meal and a comfortable bed. Physical preparation for trekking includes cycling, swimming, jogging and long walks. Trekking requires experience with basic survival skills, first aid, and orienteering when going for extended hikes or staying out overnight.