Emergency services were called to the London tourist attraction after the woman plunged 98ft to her death.
She was pronounced dead at the scene at 10.30am and St Paul’s was closed this afternoon.
City of London Police said the death was not being treated as suspicious.
The Whispering Gallery is the first of the three-dome structure inside the historic building. The height of the gallery is equivalent to seven London buses.
A statement by St Paul’s Cathedral said staff rushed to help the woman immediately.
It read: ‘The Cathedral is deeply saddened at the death of a visitor.
‘The woman fell from the Whispering Gallery to the Cathedral floor. The incident is being treated as non-suspicious by police.
‘First aid trained staff were immediately at the scene and police and paramedics arrived within minutes.
‘Although robust procedures for emergency situations are in place at St Paul’s and the response bore that out, it does not lessen the shock we feel as a close community, especially for those of us who witnessed and responded to this incident.
‘We hold also in our thoughts those visitors within the Cathedral at the time.
‘We think and pray especially at this time for the woman who died, and for all those who were close to her and who loved and cared for her.’
The cathedral will be closed for the rest of the day and an Annual National Service for Seafarers at 5pm has been cancelled.
It will re-open tomorrow for Morning Prayer at 7.30am.
via: INFORMATION NIGERIA