Karlstad is a city, the seat of Karlstad Municipality, the capital of Värmland County, and the largest city in the province Värmland in Sweden. The city had 61,492 inhabitants in 2015 with 90,882 inhabitants in the wider municipality in 2017, and is the 21st biggest municipality in Sweden. Karlstad has a university and a cathedral.

Karlstad is built on the river delta where Sweden's longest river, Klarälven, runs into Sweden's largest lake, Vänern. It has the second largest lake port in the country after Västerås.

Karlstad is often associated with sunshine and the symbol for Karlstad is a smiling sun. Karlstad is reputed to be one of the sunniest towns in Sweden and a local waitress, known as "Sola i Karlstad" (the Sun in Karlstad) for her sunny disposition, is also commemorated with a statue.