Monthey is the capital of the district of Monthey in the canton of Valais in Switzerland.
In Monthey about 4,644 or (33.3%) of the population have completed non-mandatory upper secondary education, and 1,361 or (9.8%) have completed additional higher education (either university or a Fachhochschule). Of the 1,361 who completed tertiary schooling, 53.6% were Swiss men, 28.7% were Swiss women, 11.1% were non-Swiss men and 6.6% were non-Swiss women.
As of 2000, there were 256 students in Monthey who came from another municipality, while 389 residents attended schools outside the municipality.
Monthey is home to the Médiathèque de Monthey library. The library has (as of 2008) 41,818 books or other media, and loaned out 95,847 items in the same year. It was open a total of 265 days with average of 20 hours per week during that year.