Jansrud clocked a time of 1:18.14 to top the podium and land Norway's fourth straight gold medal in the event, equalling the longest winning streak in men's alpine skiing.
That record is now shared with Austria, who won four straight slalom golds between 1952 and 1964, while Jansrud added to his bronze in this year’s downhill event and silver in the giant slalom in Vancouver.
American Andrew Weibrecht, who won bronze in the super-G four years ago, produced a late charge to go one better this time, finishing 0.30 seconds behind Jansrud to claim silver.
The bronze medal was shared, after Weibrecht's US teammate Bode Miller and Canadian Jan Hudec each completed the course in 1:18.67, another 0.23 seconds back.
The medal is Miller's first of the 2014 games but his sixth in Winter Olympics, equalling the tally of retired American speed-skater Bonnie Blair. Only Apolo Anton Ohno has more among US athletes, with eight.
And the result also makes 36-year-old Miller the oldest medallist in Olympic alpine skiing, breaking Norwegian Kjetil André Aamodt's record.
© Sportsbeat 2014