2018 Alpine Skiing World Cup – Men's giant slalom

The men's giant slalom in the 2018 FIS Alpine Skiing World Cup involved eight events, including a parallel giant slalom. Marcel Hirscher of Austria won six of the races this season and easily won the discipline for the fourth straight season, his fifth total win in this discipline, on his way to his seventh straight overall World Cup championship. Hirscher clinched the victory after winning the next-to-last race of the season in Kranjska Gora, Slovenia.

The season was interrupted by the 2018 Winter Olympics from 12 to 24 February 2018 at Yongpyong Alpine Centre (slalom and giant slalom) at the Alpensia Sports Park in PyeongChang and at the Jeongseon Alpine Centre (speed events) in Jeongseon, South Korea. The men's giant slalom was held on 18 February.

Standings
{{legend|plum|Parallel giant slalom (PG)}}
 * {{legend|#ffcf40|Winner}}
 * {{legend|#c0c0c0|2nd place}}
 * {{legend|#cc9966|3rd place}}
 * DNS = Did not start
 * DNF1 = Did not finish run 1
 * DSQ1 = Disqualified run 1
 * DNQ = Did not qualify for run 2
 * DNF2 = Did not finish run 2
 * DSQ2 = Disqualified run 2

Updated at 18 March 2018 after all events.