The 2019 Atlantic Hockey Tournament is the 15th Atlantic Hockey Tournament. It was played between March 8 and March 23, 2019, at home campus locations and at the HarborCenter in Buffalo, New York. By winning the tournament, American International earned Atlantic Hockey's automatic bid to the 2019 NCAA Division I Men's Ice Hockey Tournament.
The tournament features four rounds of play. In the first round the sixth and eleventh, seventh and tenth, and eighth and ninth seeds, as determined by the conference regular season standings, will play a best-of-three series with the winners advancing to the quarterfinals. The top five teams from the conference regular season standings receive a bye to the quarterfinals. There, the first seed and lowest-ranked first-round winner, the second seed and second-highest-ranked first-round winner, the third seed and highest-ranked first-round winner, and the fourth seed and the fifth seed will play a best-of-three series, with the winners advancing to the semifinals. In the semifinals, the highest and lowest seeds and second-highest and second-lowest remaining seeds will play a single game each, with the winners advancing to the championship game. The tournament champion will receive an automatic bid to the 2019 NCAA Division I Men's Ice Hockey Tournament.
Teams are reseeded for the quarterfinals and semifinals
<small>Note: * denotes overtime period(s)</small>
<nowiki>*</nowiki> Most Valuable Player(s)