| Ypäjä | |
| Official Name: | Finnish: Ypäjän kunta Swedish: Ypäjä kommun |
| Settlement Type: | Municipality |
| Coordinates: | 60.8083°N 40°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Finland |
| Subdivision Type1: | Region |
| Subdivision Name1: | Tavastia Proper |
| Subdivision Type2: | Sub-region |
| Subdivision Name2: | Forssa sub-region |
| Leader Title: | Municipal manager |
| Leader Name: | Tatu Ujula |
| Established Title: | Charter |
| Established Date: | 1876 |
| Blank3 Name: | Climate |
| Blank3 Info: | Dfc |
| Timezone: | EET |
| Utc Offset: | +02:00 |
| Timezone Dst: | EEST |
| Utc Offset Dst: | +03:00 |
Ypäjä is a municipality located in the countryside of South-Western Finland. It belongs to the province of Southern Finland and the region of Tavastia Proper. The municipality has a population of and covers an area of NaNYpäjä}} ofwhich NaNYpäjä}}is water. The population density isNaNYpäjä. The municipality is unilingually Finnish.
The main population centre of Ypäjä is a small village situated on the river Loimijoki, between the towns of Forssa (23 km to the east from Ypäjä) and Loimaa (15 km to the west). Although officially part of the Forssa region, Ypäjä is often also considered to belong to the Loimaa region as it has traditionally been influenced by both towns. Besides Loimaa, its direct neighbours are Jokioinen, Humppila, Somero and Koski Tl.
The distances from Ypäjä to the three major cities in southern Finland are relatively short: to Turku, 96km (60miles) to Tampere, and 132km (82miles) to the capital Helsinki.
Ypäjä is probably best known for horses; the municipality e.g. has an Equine College and hosts an annual international riding competition called Finnderby.
Ypäjä's coat of arms is designed by Aukusti Tuhka.