The 2012 MSBL season was the 24th season of the Men's State Basketball League (SBL). The regular season began on Friday 16 March and ended on Saturday 28 July. The finals began on Saturday 4 August and ended on Saturday 1 September, when the Cockburn Cougars defeated the East Perth Eagles in the MSBL Grand Final.

The regular season began on Friday 16 March and ended on Saturday 28 July after 20 rounds of competition. An additional round was added in 2012 to lighten the travel load of regional teams.^[1]

Due to an ineligible player taking part in SBL qualifying games, the Willetton Tigers were deemed to have forfeited three games that were won across June and July. In rounds thirteen to nineteen, the Tigers suited up a player for a total of seven games and failed to lodge a contract, player registration and proof of citizenship which are all documents required by the league before a player is eligible to play. As a result, they were dropped from a 12–13 record to 9–16 heading into the final round.^[2]

The finals began on Saturday 4 August and ended on Saturday 1 September with the MSBL Grand Final.

Bracket

	Quarter-finals							Semi-finals							Grand final
	1	Wanneroo Wolves	108	103	X
	8	Kalamunda Eastern Suns	99	69	X
								1	Wanneroo Wolves	77	67	X
								4	East Perth Eagles	82	83	X
	4	East Perth Eagles	91	93	94
	5	Mandurah Magic	99	90	79
																East Perth Eagles	72	X	X
																Cockburn Cougars	105	X	X
	2	Lakeside Lightning	96	90	X
	7	Goldfields Giants	82	87	X
								2	Lakeside Lightning	91	64	92
								3	Cockburn Cougars	98	59	102
	3	Cockburn Cougars	106	114	X
	6	Perth Redbacks	74	79	X