| Montesson | |
| Commune Status: | Commune |
| Image Coat Of Arms: | Blason ville fr Montesson (Yvelines).svg |
| Arrondissement: | Saint-Germain-en-Laye |
| Canton: | Houilles |
| Insee: | 78418 |
| Postal Code: | 78360 |
| Mayor: | Nicole Bristol[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Saint Germain Boucles Seine |
| Coordinates: | 48.9085°N 2.1496°W |
| Elevation M: | 45 |
| Elevation Min M: | 23 |
| Elevation Max M: | 56 |
| Area Km2: | 7.36 |
Montesson (pronounced as /fr/) is a commune in the Yvelines department in the Île-de-France region in north-central France. It is located in the western suburbs of Paris.
Transport in Montesson is served by buses with T-tickets as well as by several Paris-suburban lines: Line 01, Line 04, Line 07, Line 19, Line 22. The bus tickets have a category called "Bus T" which is for occasional users and replaces the old tickets in the notebooks of the previous bus network.The T ticket is also valid on the entire metro (Paris and suburbs) on the RER lines of the RATP and the SNCF. It is sold for a single price of 1.70 € for a journey or 12.50 € for a book of 10. It can be purchased all around the Ile de France metro stations, RER stations, bus terminals, and RATP authorized dealers.