"Cricket will resume on Saturday to pay tribute to Her Majesty Queen Elizabeth II and honour her remarkable life and service," the England and Wales Cricket Board (ECB) said.
In a statement the ECB said that domestic and recreational cricket matches would also go ahead as planned at the weekend in line with Official National Mourning guidance.
England women's Twenty20 against India will also go ahead.
The ECB said a minute's silence would be observed at The Oval followed by the national anthem.
"All players and coaches will wear black armbands. Branded inventory will be replaced with messaging paying cricket's respects to The Queen," the ECB said.
The opening day of the decider was washed out by rain on Thursday. It is unclear as to whether Saturday's play will be day two or day three of the test match.
The series is locked at 1-1.
