2016 FINA World Swimming Championships (25 m) – Men's 400 metre freestyle

The Men's 400 metre freestyle event at the 2016 FINA World Swimming Championships (25 m) was held in Windsor, Ontario, Canada. It was part of the short course championships, meaning the competition took place in a 25-metre pool, as opposed to the Olympic-sized 50-metre pool.

The event featured male swimmers competing individually in a freestyle race covering a distance of 400 metres. The 400-metre freestyle requires a combination of speed, endurance, and efficient technique, with athletes typically employing front crawl as their stroke.

The competition consisted of preliminary heats to determine the fastest swimmers who would then advance to the final. The final race determined the medal winners: gold for first place, silver for second place, and bronze for third place. The times achieved in both the heats and the final contributed to the overall results of the championships and were considered for world records. The results of this specific event are officially recorded by FINA, the international governing body for swimming.