The 72-metre-tall sightseeing tower is believed to have been brought to a halt by a breakdown, with the Fire Services Department saying it had been alerted to the incident at around 3.30pm.
Ocean Park staff used a backup stairwell to evacuate roughly 40 people trapped, while one person who reported feeling unwell was taken to the ground by a firefighter.
The director of Electrical and Mechanical Services, Poon Kwok-ying, said the department would investigate the incident to determine the cause.
This is the second incident involving the ride in slightly over a year, with the tower attraction also brought to a halt in May 2025, when its safety mechanism was triggered.
Passengers were stranded for nearly two hours at that time.
The tower, located about 200 metres above sea level, sits on Nam Long Shan and offers panoramic views of Deep Water Bay.