Dolan did not enjoy a good 2012 World Championship as he lost 0–3 in the first round to Kim Huybrechts, picking up just two legs during the match.
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He comfortably beat world number four Gary Anderson, Vincent van der Voort and Justin Pipe to reach the semi-finals for the second successive year and the second successive major event.
Brendan Behan | Brendan Fraser | James Dolan | Brendan Perry | Brendan Byrne | Brendan O'Carroll | Brendan Benson | Mark Dolan | Brendan Coyle | Brendan Bowyer | Joe Dolan | Brendan Joyce | James L. Dolan | David Brendan Hopes | Brendan Steele | Brendan Shine | Brendan Shanahan | Brendan O'Leary | Brendan Nelson | Brendan Keyes | Brendan I. Koerner | Brendan Grace | Brendan Gleeson | Brendan Dolan | Brendan Beiser | Brendan | Timothy M. Dolan | 'Galway Joe' Dolan | Dolan Springs, Arizona | Dolan Springs |
He later reached the quarter finals of the Gleneagle Irish Masters, beating Terry Jenkins, Nick Fullwell, and Andy Jenkins before losing 5-2 to Brendan Dolan.