Tresticklan National Park, National park in Dalsland, Sweden

Tresticklan National Park covers 28.97 km² in Dals-Ed Municipality, northwestern Dalsland, along the Norwegian border. It protects one of southern Scandinavia's few remaining old-growth forests, mostly open pine woodland with scattered bogs and smaller spruce, aspen and birch stands. The landscape of rocky heights and fissure valleys holds many small nutrient-poor lakes, including the trident-shaped Stora Tresticklan.

Tresticklan National Park was established in 1996 in Dals-Ed Municipality, northwestern Dalsland, along the Norwegian border, covering 28.97 km². A wildfire swept the area in 1830, and the pines adapted with thicker bark; some trees are now over 250 years old. Since January 2005 the park has been classified as a Natura 2000 site under the name Trestickla-Boksjön.

The name Tresticklan means "trident", referring to Lake Stora Tresticklan, whose three nearly parallel basins are joined by narrow channels. The lake gives the park its name and lies at its centre. Since January 2005 the area has also been listed as a Natura 2000 site under the name Trestickla-Boksjön.

Access is easiest via the road between Ed and Nössemark; the Råbocken car park lies about 600 m from the eastern edge and is the starting point for the roughly 8 km Tresticklaleden loop. From the southern junction at Bråtane a short detour leads to Orshöjden, the park's highest point at 276 m. Open fires are forbidden, but picking berries and mushrooms for personal use is allowed.

The park's highest point, Orshöjden, rises 276 meters above sea level and offers sweeping views across sparse pine forests and numerous lakes. Many hikers overlook this summit, though it provides a rare vantage point over the larger forest landscape of the region.