| 01 Sept 14 | P. Wollscheid Philipp Wollscheid |  Bayer LeverkusenLEV | → |  MainzMAIN | Loan |
| 15 Aug 14 | R. Seung-Woo Ryu Seung-Woo | Bayer LeverkusenLEV | → |  TSV Eintracht BraunschweigEBS | Loan |
| 03 Aug 14 | K. Papadopoulos Kyriakos Papadopoulos |  Schalke 04SCHA | → | Bayer LeverkusenLEV | Loan |
| 09 Jul 14 | K. Stafylidis Konstantinos Stafylidis | Bayer LeverkusenLEV | → |  FulhamFUL | Loan |
| 09 Jul 14 | K. Stafylidis Konstantinos Stafylidis | Bayer LeverkusenLEV | → | FulhamFUL | Loan |
| 04 Jul 14 | H. Calhanoglu Hakan Calhanoglu |  Hamburg SVHSV | → | Bayer LeverkusenLEV | Undisclosed |
| 03 Jul 14 | E. Can Emre Can | Bayer LeverkusenLEV | → |  LiverpoolLIV | Undisclosed |
| 03 Jul 14 | E. Can Emre Can | Bayer LeverkusenLEV | → | LiverpoolLIV | Undisclosed |
| 01 Jul 14 | S. Sam Sidney Sam | Bayer LeverkusenLEV | → | Schalke 04SCHA | Free |
| 01 Jul 14 | T. Jedvaj Tin Jedvaj |  AS RomaROMA | → | Bayer LeverkusenLEV | Loan |
| 01 Jul 14 | A. Milik Arkadiusz Milik | Bayer LeverkusenLEV | → |  Ajax AmsterdamAJA | Loan |
| 01 Jul 14 | Wendell |  GrêmioGRE | → | Bayer LeverkusenLEV | Undisclosed |
| 01 Jul 14 | T. Jedvaj Tin Jedvaj | AS RomaROMA | → | Bayer LeverkusenLEV | Loan |
| 01 Jul 14 | J. Drmic Josip Drmic |  NurnbergNUR | → | Bayer LeverkusenLEV | 5000000 |
| 01 Jul 14 | Wendell | GrêmioGRE | → | Bayer LeverkusenLEV | Undisclosed |
| 01 Jul 14 | J. Hegeler Jens Hegeler | Bayer LeverkusenLEV | → |  Hertha BerlinHERT | Undisclosed |
| 01 Jul 14 | Vladlen Yurchenko | SDXShakhtar DonetskShakhtar Donetsk | → | Bayer LeverkusenLEV | Undisclosed |
| 01 Jul 14 | D. Kresic Dario Kresic | MainzMAIN | → | Bayer LeverkusenLEV | Free |
| 01 Jul 14 | J. Meffert Jonas Meffert | Bayer LeverkusenLEV | → |  Karlsruher SCKAR | Free |
| 01 Jul 14 | A. Milik Arkadiusz Milik | Bayer LeverkusenLEV | → | Ajax AmsterdamAJA | Loan |
| 30 Jan 14 | A. Guardado Andrés Guardado |  ValenciaVAL | → | Bayer LeverkusenLEV | Loan |
| 30 Jan 14 | A. Guardado Andrés Guardado | ValenciaVAL | → | Bayer LeverkusenLEV | Loan |
| 13 Jan 14 | K. Stafylidis Konstantinos Stafylidis | Bayer LeverkusenLEV | → |  FC AugsburgAUG | Loan |