Birdwatching or birding is the observation of birds as a recreational activity. It can be done with the naked eye, through a visual enhancement device like binoculars and telescopes, or by listening for bird sounds.

Birding often involves a significant auditory component, as many bird species are more easily detected and identified by ear than by eye. Most birdwatchers pursue this activity mainly for recreational or social reasons, unlike ornithologists, who engage in the study of birds using more formal scientific methods.

Many birdwatchers occupy themselves with observing local species (birding in their "local patch"), but may also make specific trips to observe birds in other locales. The most active times of the year for birding in temperate zones are during the spring or fall migrations when the greatest variety of birds may be seen. On these occasions, large numbers of birds travel north or south to wintering or nesting locations. Early mornings are typically better as the birds are more active and vocal making them easier to spot.
Certain locations such as the local patch of forest, wetland and coast may be favoured according to the location and season. Seawatching is a type of birdwatching where observers based at a coastal watch point, such as a headland, watch birds flying over the sea. This is one form of pelagic birding, by which pelagic bird species are viewed. Another way birdwatchers view pelagic species is from seagoing vessels.