Oberbözberg is a former municipality in the district of Brugg in canton of Aargau in Switzerland. On 1 January 2013 the former municipalities of Gallenkirch, Linn, Oberbözberg and Unterbözberg merged to form the new municipality of Bözberg.
Oberbözberg is first mentioned in 1189 as Bozeberch. Until 1873, the municipality was part of Bözberg, which split into Oberbözberg and Unterbözberg.
Oberbözberg had an area, as of 2009, of 5.45 square kilometers (2.10 sq mi). Of this area, 2.75 square kilometers (1.06 sq mi) or 50.5% is used for agricultural purposes, while 2.4 square kilometers (0.93 sq mi) or 44.0% is forested. Of the rest of the land, 0.26 square kilometers (0.10 sq mi) or 4.8% is settled (buildings or roads), 0.02 km2 (4.9 acres) or 0.4% is either rivers or lakes.
Of the built up area, housing and buildings made up 2.9% and transportation infrastructure made up 1.7%. 43.5% of the total land area is heavily forested. Of the agricultural land, 32.8% is used for growing crops and 14.3% is pastures, while 3.3% is used for orchards or vine crops. All the water in the municipality is in rivers and streams.