TRUE Blue Tattooing has sustained its fourth arson attack since the shop opened in November last year.
Police arrived at the tattoo parlour in Murray Street, Camden, at 4.55am today after receiving a call that the shop had been set on fire.
The police found the front door and the footpath alight and the roof badly damaged by smoke and fire.
They said adjacent businesses had not been damaged.
Police are treating the fire as suspicious and have secured the shop as a crime scene.
Camden crime manager Paul Albury wants witnesses to come forward.
Camden councillors in October approved the shop 7-1 in spite of community objections including a petition that more than 200 people had signed.
Readers of the Advertiser's website largely supported the shop.
The shop owners, Michelle Smith and boxer Rob Medley, told the Advertiser at the time they wanted to break the poor stereotype of tattoo shops and run theirs as "a clean, happy, family-owned and run shop".
Ms Smith has told the Sun-Herald she believed the shop was under attack from bikie gangs.
Witnesses can call Camden police on 4655 0599 or Crime Stoppers on 1800 333 000.