Myrica gale is a species of flowering plant in the family Myricaceae native to parts of Eurasia and North America. Common names include bog-myrtle, sweet willow, Dutch myrtle, and sweetgale.

Myrica gale is a deciduous shrub growing to 2 metres (6+1⁄2 feet) tall and 1 m wide. The leaves are spirally arranged, simple, 2–5 centimetres (3⁄4–2 inches) long, oblanceolate with a tapered base and broader tip, and a crinkled or finely toothed margin. The red–orange flowers are catkins, with male and female catkins on separate plants (dioecious). The fruit is a small, waxy drupe.

Bog-myrtle is distributed throughout parts of the Northern Hemisphere, including Japan, North Korea, Russia, mainland Europe, the British Isles, Canada and the United States.

It typically grows in acidic peat bogs, and to cope with these difficult nitrogen-poor growing conditions, the roots have nitrogen-fixing actinobacteria which enable the plants to grow.

Sweetgale can grow in a narrow band in the intertidal zone, especially if logs have been washed into the estuary on which to establish itself. It is a favorite food of beavers, and low beaver dams can be found in the intertidal zone if sufficient sweetgale is present. The ponds thus formed are often completely submerged at high tide but retain enough water at low tide to provide refuge for fish. If too deep for predation by wading birds, juvenile salmon may flourish.

The foliage has a sweet resinous scent and is a traditional insect repellent, used by campers to keep biting insects out of tents. It is also a traditional component of royal wedding bouquets and is used variously in perfumery and as a condiment.

In Scotland, UK, it has been traditionally used to ward off the Highland midge, and it is marketed as an insect repellent and as an ingredient in some soaps.

The leaves can be dried to make tea, and both the nutlets and leaves can be used (either chopped or dried) to make a seasoning.