Queen's spring, Mineral spring in Spa, Belgium.

Queen's spring is a mineral spring in Spa whose water is very low in minerals and contains no carbonation, unlike the town's iron-rich, sparkling sources. The water rises in a small whitewashed pavilion built in 1921–1922, set in woods about 200 m from the Rue de la Sauvenière (N62), below the Spa-La Sauvenière airfield and the Malchamps peat bog.

The spring's pavilion was built in 1921-1922 and inaugurated on 15 June 1933 by Queen Elisabeth, who dedicated it to Queen Marie-Henriette of Austria, the second queen of the Belgians, who had stayed in Spa several times and liked the place and its water. A plaque on the pavilion records the inauguration.

The spring is named after Marie-Henriette of Habsburg-Lorraine, second queen of the Belgians, who stayed in Spa several times and liked the spot and its water. The whitewashed pavilion carries a plaque recording that Queen Elisabeth inaugurated it on 15 June 1933, granting the name to Marie-Henriette. The spring should not be confused with the source Marie-Henriette at Nivezé near Lake Warfaaz.

The spring lies in woodland about 200 m from the N62, locally called Rue de la Sauvenière, below the Spa-La Sauvenière airfield and the Malchamps peat bog. The whitewashed spring house itself is not open to visitors; the water emerges inside it. The Sauvenière spring is about 500 m to the north.

The spring's water is very low in minerals: magnesium 1 mg/l, sodium 3 mg/l and potassium 0.5 mg/l. It is sold as Spa Reine, known as Spa Blauw, and is used in cures for rehydration, low-sodium diets and diuresis.