"I expect authorities of Myanmar will respond positively and in a timely manner to the expectation and concerns and repeated calls of the international community to release all political prisoners and particularly Aung San Suu Kyi," he told reporters on Wednesday.
He spoke after convening a meeting of the "Group of Friends of the Secretary-General on Myanmar" and said he received strong support from its 14 members for his release call.
The group brings together Australia, Indonesia, Russia, the United States, China, Japan, Singapore, Vietnam, France, Norway, Thailand, India, Portugal and Britain.
Ban said the group agreed to hold a second high-level meeting on the sidelines of the UN General Assembly next month similar to one he hosted last year.
Aung San Suu Kyi faces up to five years in jail if convicted of violating her house arrest rules, after an American man swam uninvited to her lakeside home in May.
On July 31, a Myanmar court postponed its verdict in Aung San Suu Kyi's trial until August 11, adding to uncertainty over the ruling junta's plans for the democracy icon.
Lawyers for the Nobel laureate said the judges announced they needed time to review the case.
