Sidaz Jack (born 8 June 2011) is a white and blue male greyhound.

[2] Sidaz Jack was sired by Westmead Hawk from the dam Ballaghboy Cool and was born on 8 June 2011.

[5] Sidaz Jack was entered into the 2013 English Greyhound Derby and won two of the qualifying races en route to the final.

[7] Sidaz Jack was injured in September 2013 and was withdrawn from the East Anglian Derby at Yarmouth Stadium prior to the quarter final,[5] and it was decided to rest him in preparation for the 2014 racing season.

[8] Lister had checked him following an earlier round and found the back of one of his front legs was bruised, which he thought might have occurred during the race.