The 2012 Southern 100 held between Monday 9 July and Thursday 12 July on the 4.25-mile Billown Circuit near Castletown, Isle of Man.

[1] Monday 9 July 2012 First Practice Session Billown Course Thursday 12 July 2012 9 laps – 42.50 miles Billown Circuit Fastest Lap and New Course Record: Michael Dunlop, 2' 14.702 113.584 mph on lap 6