Chasing a target of 326, Pakistan reached 329-7 in 48.3 overs, winning the final with nine balls to spare and lifting the trophy in front of their home crowd.
Pakistan suffered an early setback as Sri Lankan fast bowler Dilshan Madushanka struck twice in his opening two overs, dismissing Maaz Sadaqat for five and Babar Azam for a duck. The hosts were left struggling at 14-2.
However, Fakhar Zaman and Saad Baig steadied the innings with a 149-run partnership for the third wicket. Baig scored 74 off 75 balls, hitting 11 boundaries, before Maheesh Theekshana dismissed him in the 27th over.
Fakhar continued the chase alongside Salman Ali Agha, adding 57 runs for the fourth wicket. During the partnership, the left-handed batter completed his 12th ODI century.
Madushanka eventually dismissed Fakhar in the 34th over. The opener scored 127 off 99 deliveries, including 11 fours and six sixes, giving Pakistan a strong platform in their pursuit of the target.
Salman Ali Agha departed two overs later for 17, leaving Pakistan at 230-5 after 36.5 overs.
With the match entering a decisive stage, Hasan Nawaz and Arafat Minhas produced a crucial 94-run partnership to bring Pakistan closer to victory.
Minhas led the attack with an impressive 61 off just 31 balls, hitting four sixes and three fours. His innings ended in the 48th over when Asitha Fernando dismissed him.
Fernando struck again in the same over, removing Faheem Ashraf for a golden duck and reducing Pakistan to 324-7.
Captain Shaheen Shah Afridi then finished the chase in style, hitting Madushanka for a six over square leg on the third delivery of the penultimate over to secure Pakistan's victory.
Madushanka was Sri Lanka's most successful bowler, taking three wickets for 63 runs in 9.3 overs. Fernando claimed two wickets, while Theekshana and Dunith Wellalage took one each.
Kamindu Mendis leads Sri Lanka to 325
Earlier, Sri Lanka posted 325-8 in their allotted 50 overs after being asked to bat first, with Kamindu Mendis scoring a brilliant century.
Openers Avishka Fernando and Kamindu provided a solid start, putting together 87 runs for the first wicket. Salman Ali Agha broke the partnership by dismissing Avishka leg before wicket for 38 off 49 balls.
Sri Lankan captain Kusal Mendis managed only eight runs before Salman claimed his second wicket through a caught-and-bowled dismissal, leaving the visitors at 109-2.
Kamindu then joined Pavan Rathnayake, and the pair added 146 runs for the third wicket to rebuild the innings.
Kamindu registered his maiden ODI century before Shaheen Shah Afridi dismissed him for 131 off 128 deliveries. His innings included 12 fours and two sixes.
Rathnayake continued the scoring with 77 off 65 balls, including eight boundaries, before Haris Rauf ended his innings.
Shaheen also removed Dasun Shanaka for 17, while Naseem Shah dismissed Janith Liyanage and Sahan Arachchige. Haris Rauf claimed another wicket by removing Dunith Wellalage.
Late contributions from Asitha Fernando and Maheesh Theekshana helped Sri Lanka reach 325-8. Fernando remained unbeaten on six, while Theekshana finished on nine not out.
For Pakistan, Shaheen Shah Afridi, Naseem Shah, Salman Ali Agha and Haris Rauf took two wickets each.
