Most shows in central London will be closing on 19 September for the Queen's funeral, the Society of London Theatre and UK Theatre (SOLT) has said.
The organisation said that more than 20 shows have confirmed that performances scheduled for the day will no longer be going ahead due to the scheduling of the funeral and out of respect for all who are mourning.
It said ticketholders will receive an email from their point of purchase with details regarding exchanges and refunds.
"Throughout the period of national mourning, performances will go ahead as planned but we would advise audiences coming into central London to allow more time for their journeys to and from the theatre from Wednesday when the Queen will be lying in State," a statement said.
It added that in regards to the national one minute silence at 8pm on Sunday 18 September, shows that are playing on that evening will mark it prior to curtain up.