Swimming at the 2009 Maccabiah Games – Women's 400 metre individual medley
The women's 400 metre individual medley event at the 2009 Maccabiah Games took place on 20 July at the Wingate Institute. This swimming event used medley swimming. Because an Olympic size swimming pool is 50 metres long, this race consisted of eight lengths of the pool. The first two lengths were swum using the butterfly stroke, the second pair with the backstroke, the third pair of lengths in breaststroke, and the final two were freestyle. Unlike other events using freestyle, swimmers could not use butterfly, backstroke, or  breaststroke for the freestyle leg; most swimmers use the front crawl in freestyle events anyway. Two heats were held. The heat in which a swimmer competed did not formally matter for advancement, as the swimmers with the top eight times from the entire field qualified for the final; there, they all competed in a single final heat to earn final placements. Nations with three or more swimmers meeting the standard could enter only three such swimmers in the final.