Cross-country skiing is the most Swedish sport of all. Skiers slide across long flat tracks, using their arms to push off with poles. It is brilliant exercise - your whole body works at once - and you can travel huge distances. Some Swedes use cross-country skis just to get to the shops in winter.
Once a year, around 16,000 skiers take part in a giant race called Vasaloppet. They ski 90 kilometres in one day - about the distance from London to Brighton. It is the biggest cross-country ski race in the world, and it has been held in Sweden every year since 1922.
Ice hockey is Sweden's most-watched team sport in winter. Two teams of six players skate around a sheet of ice trying to hit a small black disc (the puck) into the other team's net using long sticks. Sweden's national team is called 'Tre Kronor' - 'Three Crowns' - and has won the World Championship eleven times.
Many Swedish children learn to skate before they can ride a bike. Schools often have an ice rink in the playground in winter, and lakes freeze so solid you can walk - or skate - across them. There's a special kind of ice skating called 'long-distance skating' where people travel for tens of kilometres across frozen lakes, with sandwiches in their backpacks.