Football supporters submitted a Freedom of Information request to obtain the tenancy agreement amid claims the London Legacy Development Corporation (LLDC) would subsidise the rent.
An Information Commissioner has said LLDC, which denied the claims, must now comply with the FOI request.
LLDC had refused to reveal its rent on grounds of commercial sensitivity.
The decision comes ahead of West Ham moving into the stadium for the start of the 2016-2017 football season.
In reaching a decision dated 3 September, the commissioner said neither West Ham nor LLDC had been able to show how revealing the details of the tenancy agreement would place them at a commercial disadvantage or how this information could be exploited by a competitor.
The stadium was built using tax payers' money and is currently in public ownership.
LLDC manages the stadium and is believed to be considering whether to appeal against the independent commissioner's decision.
A coalition of 14 supporters' trusts from around the country called on LLDC head, London Mayor Boris Johnson, to waive its right to appeal.
They said an appeal would further delay the publication of the tenancy agreement, which they argue is in the public interest.
In a statement, the trusts said the deal raised issues over the apparent use of public money to "subsidise a commercial football business".
"It seems the taxpayer will be paying the cost of a series of overheads which every other club, rightly, has to pay for themselves," they said.
"It is important that the taxpayer is allowed to know exactly what has gone on here, and to judge whether it is a responsible and fair use of public money."
The supporters' trusts had argued the Olympic Stadium deal could give the Hammers a competitive advantage and asked the government to investigate in August, but the government said the deal had been "scrutinised" and rejected their request.
Previously a spokesman for the Department for Culture, Media and Sport said: "West Ham United has a concession at the stadium and their contributions reflect that status.
"The contract, awarded after an open public competition, has been widely scrutinised and tested in court. The stadium remains in public ownership and the profits from its multiple uses will flow to the taxpayer."
The Olympic Stadium deal allows West Ham to host all of their home matches at the stadium. British Athletics will take control of the arena for one month every summer.
LLDC has until 8 October to reveal the commercial details of the Olympic Stadium tenancy agreement.

Remains of a man aged between 30 and 49, were found close to the M54 motorway in Shropshire, in August.
West Mercia Police said two metal bracelets - including one thought to be a Kara, a Sikh symbol - were found inside a jacket that was also uncovered.
There have been no matches with DNA profiles of missing people in England.
The force said it was still unable to ascertain the cause of death, but it was keeping an open mind as to how the remains came to be at junction four of the M54 at Shifnal.
It is understood the remains lay undiscovered for up to three years.
2 - 3
Years the bones of a nearly complete skeleton belonging to a man had lain at the site, next to junction four of the M54
5 7 - 5 11 Height of the man
30 to 49  Years old at the time of death
Detectives said they could not rule out that "he may have been subjected to a crime".
The man, who was between 5ft 7ins and 5ft 11ins tall, was discovered by a highway worker at the bottom of an embankment.
He was wearing a black "dare2be" soft-shell outdoor jacket in a large size, a navy blue V-neck T-shirt from George at Asda and a pair of dark coloured, medium-size Nike tracksuit bottoms.
Police said that specific type of T-shirt was first manufactured in November 2007 and first sold in March 2008.
The managers of the Olympic Stadium have been told to make public the details of a rental deal with West Ham.
[NEXT_CONCEPT]
A full DNA profile has been developed of a man whose near-complete skeleton was found close to a motorway.