2012 FINA World Swimming Championships (25 m) – Men's 400 metre individual medley

The Men's 400 metre individual medley event at the 2012 FINA World Swimming Championships (25 m) took place as part of that year's short course championships. It involved swimmers completing 400 metres using all four swimming strokes in the following order: butterfly, backstroke, breaststroke, and freestyle. The distance for each stroke was 100 metres. The event consisted of preliminary heats and a final, where the fastest swimmers from the heats competed for medals. Qualification for the final was determined by the swimmers' times in the preliminary heats, typically with the top eight swimmers advancing. The individual medley requires versatility and endurance, as swimmers must be proficient in all four competitive swimming styles. The results of the race determined the World Champion for that year in the short course version of the event.