The women's 100 metre backstroke event at the 2005 Maccabiah Games took place on 13 July, at the Wingate Institute. This swimming event used the backstroke. Because an Olympic size swimming pool is 50 metres long, this race consisted of two lengths of the pool.
Three heats were held. The heat in which a swimmer competed did not formally matter for advancement, as the swimmers with the top sixteen times from the entire field qualified for the semifinals. Two semifinal heats of eight swimmers each were held. The swimmers with the eight fastest times again advanced to the finals; 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.
Records
Prior to this competition, the existing Maccabiah record was as follows.
The following new Maccabiah records were set during this competition.