Paul Stirling hit an aggressive 77 off 41 balls to lift Ireland to their first win against Bangladesh on Bangladeshi soil in Friday's third and final T20 match.
The visitors lost the opening two matches but raced to 126-3 in 14 overs after bowling out their hosts for 124 in Chittagong.
Shamim Hossain struck his maiden 50 to lift Bangladesh from a precarious 41-5 but it was not enough to deny Ireland their first win of the tour.
Stirling hit 10 fours and four sixes, including a six and three fours off consecutive deliveries, to hasten his team's victory.
Taskin Ahmed bowled Ross Adair for seven before Shoriful Islam dismissed Lorcan Tucker for four, but Stirling shared a 68-run partnership with Harry Tector for the third wicket to keep Ireland on course.