Not only did they break a string of 15 consecutive losing seasons, but they also challenged for the division crown until the final week, won a one-game playoff to secure a spot in the division series and took the Yankees to a win-or-go-home finale.
Along the way, they set numerous big league records, most notably by becoming the first team since 1900 to not endure a defeat in the regular season by means of a walk-off play, and created enough video highlights to last a lifetime, or at least until they return to baseball's biggest stage.
While 2012 was a victory for Baltimore, it also proved that the O's are still a few pieces away from competing on the same stage as the Yankees.
Clutch hitting, speed on the basepaths and patience at the plate are just a few of the areas they're going to need to see improvement in if they want to maintain their winning ways.
Here are 12 tweaks they could, and should, make to their roster before next spring's opener against the Rays.