| Jarno Saarinen Imatranajo Circuit | |
| Time: | EET (UTC+2) EEST (DST) |
| Location: | Imatra, Finland |
| Coordinates: | 61.1778°N 28.7913°W |
| Opened: | 1962 Re-opened: |
| Former Names: | Imatra Circuit (1964–1986) |
| Events: | Current: International Road Racing Championship (2016–2019, 2022–present) Former: Grand Prix motorcycle racing Finnish motorcycle Grand Prix (1964–1982) Sidecar World Championship (1967–1973, 1980–1982) Formula TT (1986) |
| Layout1: | Jarno Saarinen Imatranajo Circuit (1979–1986, 2016–present) |
| Length Km: | 4.950 |
| Length Mi: | 3.076 |
| Turns: | 11 |
| Record Time: | 1:50.616 |
| Record Driver: |  Danny Webb |
| Record Car: | BMW S1000RR |
| Record Year: | 2018 |
| Record Class: | SBK |
| Layout2: | Grand Prix Circuit (1964–1978) |
| Length Km2: | 6.030 |
| Length Mi2: | 3.747 |
| Turns2: | 14 |
| Record Time2: | 2:05.900 |
| Record Driver2: |  Johnny Cecotto |
| Record Car2: | Yamaha YZR500 |
| Record Year2: | 1977 |
| Record Class2: | 500cc |
The Imatra Circuit is a motorsport street circuit in Imatra, Finland. The circuit has existed in two versions, and has been exclusively used for the "" motorcycle road race. From 1962 to 1978 a clockwise street circuit in the east of the town of Imatra was used. The circuit ran along the Vuoksi river and a railway line that had to be crossed. From 1979 to 1986 a shorter circuit was used. This was only long and consisted mostly of the western part of the original circuit.
From the 1964 season until the 1982 season the Grand Prix of Finland was run 19 times in Imatra. From the 1983 season the "Imatranajo" lost its World Championship status due to the dangerous nature of the circuit and the death of sidecar driver Jock Taylor in 1982.[1]
The last road race on the Imatra Circuit for many years was held in 1986 when a six-year-old boy died after falling under a running wheel, but classic races still took place. Road racing returned to Imatra in August 2016[2] with a round of the International Road Racing Championship, and another round was held in 2017.[3] In the "Imatranajo" on June 15, 2019, a fatal crash occurred when a Swiss driver Mathias Gnägi with a Superbike class dropped off the track in the rain and was killed.
As of July 2018, the fastest official race lap records at the Jarno Saarinen Imatranajo Circuit are listed as:
| Category | Time | Driver | Vehicle | Event |
|---|---|---|---|---|
| Jarno Saarinen Imatranajo Circuit: 4.950 km (1979–1986, 2016–present) | ||||
| 1:50.616[4] [5] | 2018 Imatranajo IRRC SBK round | |||
| 1:54.000 | 1981 Finnish motorcycle Grand Prix | |||
| 1:55.856[6] | 2018 Imatranajo IRRC SSP round | |||
| 2:10.300 | 1979 Finnish motorcycle Grand Prix | |||
| 2:26.800 | 1979 Finnish motorcycle Grand Prix | |||
| Grand Prix Circuit: 6.030 km (1964–1978) | ||||
| 2:05.900 | 1977 Finnish motorcycle Grand Prix | |||
| 2:13.800 | 1978 Finnish motorcycle Grand Prix | |||
| 2:16.600 | 1977 Finnish motorcycle Grand Prix | |||
| 2:23.500 | 1977 Finnish motorcycle Grand Prix | |||
| 2:59.900 | 1976 Finnish motorcycle Grand Prix | |||
(Coloured background = the race was boycotted by international competitors)