| Name | Rank | Born | Died | Notes [+ indicates died while crew of boat] |
| Achilles | Albrecht | KKpt.01.10.43 | 25.01.1914 | 27.09.1943 | """GNEISENAU"" Watch Offizier. (02.39-04.40). U-66. 1WO (01.41-11.41). U-161+ Cdr.(01.01.42-27.09.43). US Mariner aircraft. All crew lost." birthplace Karlsruhe lost off Bahia Brazil 12.30S. 35.35W. serial/entry Crew of 1934 awards U-boat Badge. 07.08.41.(U-66). E.K.2. 07.08.41.(U-66). E.K.1. 05.04.42.(U-161). Knights Cross 16.01.43.(U-161). |
| Angerstein | Helmuth | FkGfr | | | U-66. Pow.06.05.44. (age 20) |
| Bernbeck | | | | | U-66 |
| Birnmeyer | Paul | BtsMt | 12.05.1917 | 07.07.1942 | U-66. MtrOGfr. U-701+ birthplace Augsburg lost near Cape Hatteras awards E.K.2. |
| Breyer | Paul | OMasch | | | U-66. U-541. U-485 awards DKiG.19.07.44.U-541). |
| Brode | Kurt | MechGfr | | | U-66. Pow.06.05.44. (age 19) |
| Burian | Leonhard | MtrGfr | | | U-66. Pow.06.05.44. (age 22) |
| Buttgereit | Fritz | MaschGfr(E) | | | U-66. Pow.06.05.44. (age 20) |
| Degener-Böning | Karl | OFkMt | 28.03.1919 | | U-66. Pow.06.05.44. (age 25) awards DKiG.12.10.43 |
| Drewek | Walter | MtrOGfr | | | U-66. Pow.06.05.44. (age 21) |
| Dreyer | Heinrich | MtrOGfr | 26.12.1921 | 06.05.1944 | U-66+ 36 survivors lost W.of Cape Verde Islands. 17.17N. 32.29W. |
| Ehrlichmann | Helmut | MaschOGfr | 20.12.1922 | 06.05.1944 | U-66+ lost W.of Cape Verde Is. |
| Fickel | Kurt | MtrOGfr | | | U-66. Pow.06.05.44. (age 21) |
| Flintsch | Ludwig | Lt.ing.d.R | | | U-66. Pow. 06.05.44 |
| Frerks | Paul | OLt.z.S.d.R.01.01.43 | 25.06.1908 | | U-117. WO.(01.43-08.43). U-66. Acting Cdr.(08.43). U-975. Cdr.(11.43-06.44) |
| Friedrich | Günther | BtsMt | 16.09.1923 | 06.05.1944 | U-66+ |
| Fröhlich | Werner | StOStrm | | | U-66. Pow.06.05.44 awards DKiG. 08.10.43.(U-66). |
| Gahl | Heinz | KpLt.ing.LI | | | U-58. U-66 serial/entry Crew of 1934 awards DKiG. 01.10.43.(U-66). |
| Gaiser | Roland(Rollie) | MaschGfr | | | U-66. (Nov-42-May.44). 4 war patrols. Wounded in both legs. Pow.06.05.44. (Age 21) lost Living Canada. awards U-boat Badge. E.K.2. |
| Geisen | Peter | BtsMt | 17.04.1922 | 06.05.1944 | U-66+ |
| Gierck | Hermann | | 01.04.1908 | | U-10. U-16. U-24. U-45. U-46. U-66 |
| Grölz | Georg | MaschMt(E) | | | U-66. Pow.06.05.44. (age 24) |
| Gutzmann | Heinz | MtrOGfr | 25.05.1924 | 06.05.1944 | U-66+ |
| Hahner | Willi | MaschOGfr(E) | | | U-66. Pow.06.05.44. (age 20) |
| Haller | Heinrich | MtrOGfr | | | U-66. Pow.06.05.44. (age 21) |
| Hansen | Willi | MaschOGfr | 06.12.1921 | 06.05.1944 | U-66+ |
| Hartmann | Werner | OMaschMt | 15.03.1918 | 29.05.1986 | U-66. Pow. 06.05.44. (age 26) awards DKiG.11.04.44. |
| Herbig | Klaus-Joachim | OLt.z.S | | | U-66. 1WO. Pow.06.05.44. (age 22) awards DKiG.11.04.44. |
| Hildebrand | Hanns | | | | U-56. U-66 |
| Hoffmann | Hans | MaschGfr.(D) | | | U-66. Pow.06.05.44. (age 19) |
| Hohn | Richard | OStrm | | | U-66. Pow. 06.05.44. (Age 26) |
| Illing | Helmut | MechOGfr | 21.09.1918 | 07.06.1998 | U-66. Pow.06.05.44 |
| Jahn | Rudolf | MtrOGfr | 10.05.1924 | 06.05.1944 | U-66+ |
| Jeuschede | Karl-Heinz | MaschOGfr | 16.08.1923 | 06.05.1944 | U-66+ |
| Jung | Wilhelm | | | | U-66 |
| Keller | Horst | Mtr 2 | 12.05.1923 | 13.09.1943 | U-66+ took own life |
| Ketelsen | Richard | OLt.z.S | | | U-66. 2WO. Pow.06.05.44. (age 32) |
| Klaus | Anton | MaschOGfr(D) | | | U-66. Pow. 06.05.44. (age 21) |
| Koch | Günther | MaschOGfr | | | U-66 |
| Koch | Horst | MaschOGfr(D) | | | U-66. Pow.06.05.44. (age 23) |
| Kreienbrink | Gerhard | Mtr | 04.07.1923 | | U-355. U-66. U-732. pow.31.10.43 |
| Kressmann | Richard | | | | U-14. U-66 |
| Künkel | Helmut | MtrGfr | | | U-66. Pow.06.05.44. (age21) |
| Landvoigt | Walter | OMasch(E) | | | U-66. Pow.06.05.44. (age 27) |
| Lehmann | Heinz | MaschOGfr(E) | | | U-66. Pow.06.05.44 (age 21) |
| Lierse | Johannes | Mtr | 02.11.1921 | 01.03.1944 | U-66. U-504. U-709+ lost N.of Azores |
| Lindner | Werner | MechOGfr | 02.09.1923 | 06.05.1944 | U-66+ |
| Loch | Wolff | SanMt | | | U-66. Pow.06.05.44. (age 27) |
| Lorenz | Erich | MtrGfr | 03.02.1924 | 03.08.1943 | U-66+ aircrft attack |
| Löser | Helmut | MaschOGfr(E) | | | U-66. Pow. 06.05.44. (age21) |