Fallnafors is a village in Nässjö Municipality, in Jönköping County, Sweden. Fallnafors lies at 304 m above sea level. The nearest city is Jönköping, 29 km to the northwest. Among the landmarks around are Nydala Abbey (25 km), Malmbäck Church (5.7 km) and Almesåkra Church (13.1 km).