| 21 Nov 12 | S. Lappin Simon Lappin |  Norwich CityNOR | → |  Cardiff CityCAR | Loan |
| 21 Nov 12 | S. Lappin Simon Lappin | Norwich CityNOR | → | Cardiff CityCAR | Loan |
| 26 Oct 12 | K. Frei Kerim Frei |  FulhamFUL | → | Cardiff CityCAR | Loan |
| 26 Oct 12 | K. Frei Kerim Frei | FulhamFUL | → | Cardiff CityCAR | Loan |
| 19 Sept 12 | R. Earnshaw Robert Earnshaw | Cardiff CityCAR | → | MTAMaccabi Tel AvivMaccabi Tel Aviv | Loan |
| 18 Sept 12 | E. Parish Elliot Parish | Cardiff CityCAR | → |  Wycombe WanderersWYC | Loan |
| 31 Aug 12 | N. Maynard Nicky Maynard |  West Ham UnitedWHU | → | Cardiff CityCAR | Undisclosed |
| 31 Aug 12 | N. Maynard Nicky Maynard | West Ham UnitedWHU | → | Cardiff CityCAR | Undisclosed |
| 30 Aug 12 | C. Noone Craig Noone |  Brighton & Hove AlbionBHA | → | Cardiff CityCAR | Undisclosed |
| 24 Aug 12 | T. Smith Tommy Smith |  Queens Park RangersQPR | → | Cardiff CityCAR | Undisclosed |
| 24 Aug 12 | T. Smith Tommy Smith | Queens Park RangersQPR | → | Cardiff CityCAR | Undisclosed |
| 24 Aug 12 | D. Blake Darcy Blake | Cardiff CityCAR | → |  Crystal PalaceCRY | Undisclosed |
| 22 Aug 12 | M. Connolly Matthew Connolly | Queens Park RangersQPR | → | Cardiff CityCAR | Undisclosed |
| 22 Aug 12 | M. Connolly Matthew Connolly | Queens Park RangersQPR | → | Cardiff CityCAR | Undisclosed |
| 10 Aug 12 | C. Bellamy Craig Bellamy |  LiverpoolLIV | → | Cardiff CityCAR | Undisclosed |
| 10 Aug 12 | C. Bellamy Craig Bellamy | LiverpoolLIV | → | Cardiff CityCAR | Undisclosed |
| 08 Aug 12 | A. Gerrard Anthony Gerrard | Cardiff CityCAR | → |  Huddersfield TownHUD | Undisclosed |
| 02 Aug 12 | H. Helguson Heidar Helguson | Queens Park RangersQPR | → | Cardiff CityCAR | Undisclosed |
| 02 Aug 12 | H. Helguson Heidar Helguson | Queens Park RangersQPR | → | Cardiff CityCAR | Undisclosed |
| 27 Jul 12 | K. Bo-Kyung Kim Bo-Kyung |  Cerezo OsakaCER | → | Cardiff CityCAR | Undisclosed |
| 27 Jul 12 | T. Heaton Tom Heaton | Cardiff CityCAR | → |  Bristol CityBRC | Free |
| 25 Jul 12 | E. Velikonja Etien Velikonja | NMXNK MariborNK Maribor | → | Cardiff CityCAR | Undisclosed |
| 01 Jul 12 | J. Parkin Jon Parkin | Cardiff CityCAR | → |  Fleetwood TownFLE | Free |
| 01 Jul 12 | A. Wildig Aaron Wildig | Cardiff CityCAR | → |  Shrewsbury TownSHR | Free |
| 22 Jun 12 | J. Mutch Jordon Mutch |  Birmingham CityBIR | → | Cardiff CityCAR | Undisclosed |
| 22 Mar 12 | D. Keinan Dekel Keinan | Cardiff CityCAR | → | Bristol CityBRC | Loan |
| 02 Mar 12 | L. Lawrence Liam Lawrence |  PortsmouthPOR | → | Cardiff CityCAR | Loan |
| 09 Feb 12 | H. Vuckic Haris Vuckic |  Newcastle UnitedNEW | → | Cardiff CityCAR | Loan |
| 09 Feb 12 | H. Vuckic Haris Vuckic | Newcastle UnitedNEW | → | Cardiff CityCAR | Loan |
| 31 Jan 12 | J. Parkin Jon Parkin | Cardiff CityCAR | → |  Scunthorpe UnitedSCU | Loan |
| 30 Jan 12 | K. Harris Kadeem Harris | Wycombe WanderersWYC | → | Cardiff CityCAR | Undisclosed |
| 26 Jan 12 | S. Taiwo Solomon Taiwo | Cardiff CityCAR | → |  Leyton OrientLEY | Loan |
| 03 Jan 12 | E. Parish Elliot Parish |  Aston VillaAVL | → | Cardiff CityCAR | Undisclosed |
| 03 Jan 12 | E. Parish Elliot Parish | Aston VillaAVL | → | Cardiff CityCAR | Undisclosed |