The X Factor runner-up holds off the challenge of Michael Bublé, who rises two places to two with a repackaged edition of Christmas.
Murs sold a further 103,000 copies in its second week on sale to keep hold of the number one spot.
One Direction slip one to three with Take Me Home, while Rod Stewart climbs a place to four with Merry Christmas Baby. Neil Diamond is up three to five with his Very Best Of collection.
Elsewhere, Pink climbs 17 places to 11 with The Truth About Love. Jools Holland enters at 21 with The Golden Age of Song.
Britain's Got Talent alumni Only Boys Aloud are new at 32 with The Christmas Edition of their self-titled LP.
Bee Gees compilation Mythology lands at 33, while Tulisa scrapes in at 35 with debut LP The Female Boss.
Watch the video for 'Troublemaker' by Olly Murs below:
Source: Official Charts Company
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