Montesquiu () is a municipality in the comarca (county) of Osona in Catalonia, Spain. It is situated on the banks of the Ter river in the north of the comarca. It is on the main communication route between Barcelona and PuigcerdÃÂ, served by the N-152 road and a station on the Renfe railway line. The thirteenth-century castle is used for cultural events during the summer. Montesquiu became part of Osona in the comarcal revision of 1990. Previously, it formed part of Ripollès.