There's currently a small but growing selection of Doctor Who-based graphic novels (or "comic books" if you prefer, since the term is a little controversial among comics fans).
During the 80s and 90s, only a handful were produced, but starting in 2004, Panini have maintained a twice-yearly series of graphic novels, reprinting restored versions of comic strips from various eras of Doctor Who Magazine.
Also, in 2008, US publisher Idea & Design Works (IDW) launched two separate Doctor Who comics, one containing brand new Doctor Who strips, and one reprinting classic Doctor Who Magazine strips. IDW have been republishing both of these comic lines as a series of graphic novels since mid-2008, for example Agent Provocateur and Doctor Who Classics: Vol 1.
Note: This section only lists graphic novels that have literally been published as books (i.e. with a paperback-style cover/binding and an ISBN) not magazine anthologies, of which there have been several over the years, such as 1994's The Age of Chaos and The Dalek Chronicles, which being "magazine specials" were sold on magazine shelves and without an ISBN number. Pictures of many of these "magazine specials" can be found at Tony's Trading site.
Finally, there are two other books which are entirely comprised of comic-book content, but they're not "novels" in the sense of having a coherent narrative, so are not included in this section. These are The Doctor Who Fun Book and It's Bigger on the Inside!
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| Title: | By: | Edition: | Date: | Publisher: | ISBN: | Rating: | Reviews: | Buy: |
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|  | Voyager | John Ridgway, Steve Parkhouse & Alan McKenzie | 1st | Jan 1985 | Marvel | 1 85400 045 4 |   9 | | 

 |  | Abslom Daak: Dalek Killer | Steve Moore, Steve Dillon, David Lloyd & Lee Sullivan | n/a | Apr 1990 | Marvel | 1 85400 113 2 |   6.6 | None | 

 |  | The Mark of Mandragora | Andrew Cartmel & Paul Cornell | n/a | Oct 1993 | Virgin | 0 426 20396 8 |   8.5 | None | 

 |  | The Iron Legion | Dave Gibbons, Pat Mills, John Wagner & Steve Moore | n/a | Apr 2004 | Panini | 1 904159 37 0 |   8.8 | | 

 |  | Dragon's Claw | Dave Gibbons, Steve Parkhouse & Steve Moore | n/a | Oct 2004 | Panini | 1 904159 81 8 |   8.1 | | 

 |  | The Tides of Time | Dave Gibbons, Steve Parkhouse, Mick Austin & Steve Dillon | n/a | Jun 2005 | Panini | 1 904159 92 3 |   9 | | 

 |  | Endgame | Alan Barnes | n/a | Nov 2005 | Panini | 1 905239 09 2 |   8.3 | None | 

 |  | The Glorious Dead | John Wagner | n/a | Jul 2006 | Panini | 1 905239 44 0 |   7.7 | None | 

 |  | Oblivion | Lee Sullivan & Adrian Salmon | n/a | Oct 2006 | Panini | 1 905239 45 9 |   8.4 | None | 

 |  | The Flood | Scott Gray & Gareth Roberts | n/a | May 2007 | Panini | 978 1 905239 65 8 |   7.7 | | 

 |  | Voyager | John Ridgway, Steve Parkhouse & Alan McKenzie | 2nd | Oct 2007 | Panini | 978 1 905239 71 9 |   9 | | 

 |  | The World Shapers | John Ridgway, Grant Morrison & Jamie Delano | n/a | May 2008 | Panini | 978 1 905239 87 0 |   8.5 | | 

 |  | Doctor Who Classics: Volume 1 | Pat Mills & John Wagner | n/a | Jul 2008 | Idea & Design Works | 978 1 60010 189 2 | None | None | 

 |  | Doctor Who: Agent Provocateur | Gary Russell | n/a | Aug 2008 | Idea & Design Works | 978 1 60010 196 0 |   5.7 | None | 

 |  | The Betrothal of Sontar | Gareth Roberts | n/a | Nov 2008 | Panini | 978 1 905239 90 0 | None | None | 

 |  | Doctor Who Classics: Volume 2 | Pat Mills, John Wagner & Steve Moore | n/a | Dec 2008 | Idea & Design Works | 978 1 60010 289 9 | None | None | 

 |  | The Forgotten | Tony Lee & Pia Guerra | n/a | Apr 2009 | Idea & Design Works | 978 1 60010 396 4 |   7.5 | | 

 |  | Torchwood: Rift War | Ian Edginton, Paul Grist & Matt Brooker | n/a | Apr 2009 | Titan | 978 1 84856 238 7 | None | None | 

 |  | A Cold Day in Hell | Simon Furman | n/a | May 2009 | Panini | 978 1 84653 410 2 |   9 | None | 

 |  | Doctor Who Classics: Volume 3 | Grant Morrison, Steve Moore & Steve Parkhouse | n/a | May 2009 | Idea & Design Works | 978 1 60010 425 1 | None | None | 

 |  | The Widow's Curse | | n/a | Oct 2009 | Panini | 978 1 84653 429 4 |   7.2 | None | 

 |  | Doctor Who Classics: Volume 4 | Dave Gibbons | n/a | Oct 2009 | Idea & Design Works | 978 1 60010 534 0 | None | None | 

 |  | Through Time and Space | | n/a | Dec 2009 | Idea & Design Works | 978 1 60010 575 3 | None | None | 

 |  | Doctor Who Volume One: Fugitive | Tony Lee, Al Davison & Matthew Dow Smith | n/a | Mar 2010 | Idea & Design Works | 978 1 60010 607 1 | None | None | 

 |  | Doctor Who Classics: Volume 5 | Steve Parkhouse | n/a | Mar 2010 | Idea & Design Works | 978 1 60010 608 8 | None | None | 

 |  | Doctor Who Classics Omnibus | | n/a | May 2010 | Idea & Design Works | 978 1 60010 622 4 | None | None | 

 |  | The Only Good Dalek | Justin Richards & Mike Collins | n/a | Sep 2010 | BBC | 978 1 84607 984 9 | | | 
 |  | Doctor Who Volume Two: Tessaract | Tony Lee & Blair Shedd | n/a | Nov 2010 | Idea & Design Works | 978 1 60010 756 6 | | | 
 |  | Doctor Who Classics: Volume 6 | | n/a | Dec 2010 | Idea & Design Works | 978 1 60010 793 1 | | | 
 |  | Doctor Who Volume Three: Final Sacrifice | Tony Lee & Matthew Dow Smith | n/a | Jan 2011 | Idea & Design Works | 978 1 60010 846 4 | | | 
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