Starring Michael Fassbender as the time travelling assassin the film based on a video game debuts at the top with £5.2 million including previews.
As a star one one of the biggest movie franchises around this is by no means the highest debut gross for Fassbender, but it is good for a non franchise debut, for director Justin Kurzel it is his best grossing film to date.
Its unclear if Assassins Creed will continue to do well, it got bad reviews from the press and the audience for these films is usually front loaded so it could drop sharp in the coming weeks.
Falling from the top after 3 weeks is Rogue One although the film enjoyed a decent fourth week gross of £3.2 million which brings its total gross in the UK to £59.6.
The film wont reach the heights of The Force Awakens but this is still a great total gross, also worth a note is that the Monday - Sunday gross of £7.6 million would have put it at number 1.
Also making its debut this week is A Monster Calls at 3 with £2 million and Silence at number 4 with £1.5 million.
Rogue One is the highest total grossing film around at the moment and the longest running film this week is Storks at number 15 which has been around now for 10 weeks.
A year ago
Star Wars Episode VII: The Force Awakens made it four weeks at the top and by this point was the top grossing film in the UK ever while The Hateful Eight was the top new film at 2.
Five years ago
Mission:Impossible Ghost Protocol stayed at the top for a second weekend while Oscar winning film The Iron Lady was new at 3.
Ten years ago
Staying at the top for a second weekend was Night At The Museum while Miss Potter was the top new film at number 2.
Fifteen years ago
The Lord of The Rings: The Fellowship of The Ring stayed at the top for the new year while top new film was Behind Enemy Lines at number 3.
Twenty years ago
Evita made its debut at the top of the box office knocking 101 Dalmatians down to number 2 after 3 weeks at the top.
Twenty five years ago
Bill and Teds Bogus Journey entered the box office at the top while Curly Sue fell to number 3 after debuting at the top.