| Ähtäri | |
| Official Name: | Finnish: Ähtärin kaupunki Swedish: Etseri stad |
| Other Name: | Etseri |
| Settlement Type: | Town |
| Coordinates: | 62.55°N 28°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Finland |
| Subdivision Type1: | Region |
| Subdivision Name1: | Southern Ostrobothnia |
| Subdivision Type2: | Sub-region |
| Subdivision Name2: | Kuusiokunnat sub-region |
| Leader Title: | Town manager |
| Leader Name: | Perttu Sonninen |
| Established Title: | Charter |
| Established Date: | 1867 |
| Established Title2: | Town privileges |
| Established Date2: | 1986 |
| Timezone: | EET |
| Utc Offset: | +02:00 |
| Timezone Dst: | EEST |
| Utc Offset Dst: | +03:00 |
Ähtäri (Swedish: Etseri) is a town and municipality of Finland. It is located in the South Ostrobothnia region. The town has a population of and covers an area of NaNÄhtäri}} of which NaNÄhtäri}} is water. The population density is NaNÄhtäri. Ähtäri is located southeast of Seinäjoki.
The municipality is unilingually Finnish.
Ähtäri is known for its zoo and hotel Mesikämmen designed by Timo and Tuomo Suomalainen which is partly built within bedrock. The biggest lake in the area is Ähtärinjärvi. There is also a relatively old and small board mill called Vääräkosken Pahvi in Ähtäri.
The largest private sector employers are Inhan Tehtaat, Silver-Veneet, Tankki, and Muovilami.