The Grey by-election of 1913 was a by-election held for Grey during the 18th New Zealand Parliament. As no candidate won an absolute majority on the first ballot on 17 July, a second round was held on 24 July.[1] The seat had become vacant due to the death of Arthur Guinness. Three candidates contested the seat, and it was won by the left-wing candidate, who was elected on the second ballot with Liberal support.