It dented the Terriers’ own automatic promotion hopes, victory would have taken David Wagner’s side to within five points of Newcastle with a game in hand in the race for second spot.
But the result leaves Huddersfield fourth, a point behind Reading and seven adrift of Newcastle, with the Seagulls now 13 points clear of Reading and thus confirmed as a Premier League side next season.
Brighton had earlier beaten Wigan 2-1 at the Amex Stadium, a result which was greeted with a pitch invasion as Chris Hughton’s side all-but rubber-stamped their promotion.
Newcastle were beaten 3-1 at Ipswich meaning they are seven points behind Brighton and will likely have to settle for second place.
Colin Quaner got Huddersfield off to the perfect start, firing past Scott Carson on the angle after just seven minutes.
And it looked like it would be a winning goal before Butterfield found the back of the net with only two minutes remaining.
The result leaves the Rams in ninth, 10 points outside the playoffs and unable to break into the top six.