In the longest-spanning contest of the season, the Hawks defended home court on the strength of Paul Millsap's 37 points, 19 rebounds, and seven assists in a franchise record-tying 61 minutes.
Courtney Lee missed the chance to force a fifth extra frame when he misfired on a 3-pointer in the dying seconds. He previously hit a long ball to force the third overtime. Buckets from Carmelo Anthony sent the game into overtimes No. 1 and 2, but he fouled out before he could try again.
There were 26 lead changes and 21 ties in the contest, which saw five players foul out.
It's the first Knicks game to go four extra innings since 1951, according to ESPN Stats & Info. The last game to go in quadruple overtime was an affair between the Chicago Bulls and Detroit Pistons on Dec. 18, 2015.
With the win, the Hawks improve to 28-20 (fourth place), while yet another heart-breaker keeps the Knicks outside of the playoff picture at 21-28.