By Sportgister Ng
Arsenal’s match with PSV Eindhoven was scheduled to take place at Emirates Stadium on Thursday.
Uefa said a new date for the match would be communicated in due course.
Around 3,000 PSV fans were expected at the match.
A Uefa statement announcing the postponement, said: “This is due to the severe limitations on police resources and organisational issues related to the ongoing events surrounding the national mourning for Her Majesty Queen Elizabeth II.”
However, BBC Sport understands Chelsea’s Champions League group stage match against Red Bull Salzburg on Wednesday will go ahead as planned.
European football governing body Uefa is satisfied all security needs around the game will be met at Stamford Bridge.