| 17.4.1955 | SCCA National Pebble Beach [BM+CM+DM+EM] | | A6GCS | Bob Gillespie | | ?th |
| 24.4.1955 | SCCA Regional Thompson [UR+CM+FIII] | 16 | 300S | Bill Lloyd | | 1st |
| 30.4.1955 | WH & DCC Ibsley [S+1.5] | 110 | A6GCS | Roy Salvadori | | DNA |
| 30.4.1955 | WH & DCC Ibsley [Formula Libre] | 152 | 250F | Roy Salvadori | Gilby Engineering | 1st |
| 1.5.1955 | SCCA Regional Thompson [UR] | 24 | 300S | Bill Lloyd | | 1st |
| 1.5.1955 | SCCA Regional Thompson [CM+DM] | 24 | 300S | Bill Lloyd | | NC |
| 1.5.1955 | Mille Miglia | 544 | 150S | Leopardi / Leo | | DNA |
| 1.5.1955 | Mille Miglia | 547 | 150S | Leopardi / Leopardi | | DNA |
| 1.5.1955 | Mille Miglia | 557 | 150S | Amedeo Selmi | | DNA |
| 1.5.1955 | Mille Miglia | 615 | A6GCS | Giorgio Scarlatti | | DNF |
| 1.5.1955 | Mille Miglia | 617 | A6GCS/53 | Fedele Lampertico | | DNF |
| 1.5.1955 | Mille Miglia | 620 | A6GCS/53 | Maria Teresa de Filippis | | DNF |
| 1.5.1955 | Mille Miglia | 621 | A6GCS/53 | Francesco Giardini | | 4th |
| 1.5.1955 | Mille Miglia | 625 | A6GCS/53 | Lopez / Lopez | | 53rd |
| 1.5.1955 | Mille Miglia | 626 | A6GCS/53 | Alberico Cacciari | | DNA |
| 1.5.1955 | Mille Miglia | 627 | A6GCS | "Errepiu" | | DNA |
| 1.5.1955 | Mille Miglia | 630 | A6GCS/53 | Georges Guyot | | DNA |
| 1.5.1955 | Mille Miglia | 631 | A6GCS/53 | Siro Sbraci | | 12th |
| 1.5.1955 | Mille Miglia | 633 | A6GCS/53 | Luigi Bosisio | | DNF |
| 1.5.1955 | Mille Miglia | 634 | A6GCS | Paolo Pineschi | | DNF |
| 1.5.1955 | Mille Miglia | 635 | A6GCS | Biori | | DNA |
| 1.5.1955 | Mille Miglia | 636 | A6GCS | Giorgio Meier | | DNA |
| 1.5.1955 | Mille Miglia | 637 | A6G | I. Zetta | | DNA |
| 1.5.1955 | Mille Miglia | 638 | A6GCS/53 | Pietro Pagliarini | | 29th |
| 1.5.1955 | Mille Miglia | 640 | A6GCS/53 | Palmer Aprile | | DNF |
| 1.5.1955 | Mille Miglia | 641 | A6GCS | Silvio Cesarin | | DNF |
| 1.5.1955 | Mille Miglia | 642 | A6GCS | Azzurro Manzini | | DNA |
| 1.5.1955 | Mille Miglia | 643 | A6GCS/53 Pininfarina Coupe | Magi Diligenti / Minzoni | Count Alberto Magi Diligenti | 109th |
| 1.5.1955 | Mille Miglia | 645 | A6GCS/53 | Attilio Buffa | | DNF |
| 1.5.1955 | Mille Miglia | 646 | A6GCS/53 | Luigi Bellucci | | 9th |
| 1.5.1955 | Mille Miglia | 647 | A6GCS/53 | Luigi Olivari | | 20th |
| 1.5.1955 | Mille Miglia | 648 | A6GCS | Piero Airaldi | | DNF |
| 1.5.1955 | Mille Miglia | 650 | A6GCS/53 | Sterzi / Viganò | | 17th |
| 1.5.1955 | Mille Miglia | 651 | A6GCS/53 | Luigi Musso | | DNF |
| 1.5.1955 | Mille Miglia | 711 | | Guerino Bertocchi | | DNA |
| 1.5.1955 | Mille Miglia | 727 | 300S Fantuzzi | Cesare Perdisa | Officine Alfieri Maserati | DNF |
| 7.5.1955 | Silverstone International | 21 | A6GCS | Cliff Davis | Gilby Engineering | DNA |
| 7.5.1955 | GP Napoli | 46 | A6GCS | Raffaele Argenziano | | DNS |
| 7.5.1955 | GP Napoli | 48? | A6GCS/53 | Luigi Bellucci | | 1st |
| 7.5.1955 | GP Napoli | | A6GCS/53 | Enzo Lopez | | 5th |
| 7.5.1955 | GP Napoli | | | Giorgio Scarlatti | | 2nd |
| 8.5.1955 | Eläintarhanajo | 6 | A6GCS/53 | André Loëns | | 7th |
| 8.5.1955 | GP Spa | 21 | A6GCS/53 | Benoît Musy | | 4th |
| 13.5.1955 | Ulster Trophy | | | Sidney Durbridge | | DNF |
| 14.5.1955 | MMKMC Silverstone [R2.5] | 93 | | H. G. Dudley | | 4th |
| 15.5.1955 | GP Bari [S2.0] | 2 | A6GCS/53 | Francesco Giardini | | DNF |
| 15.5.1955 | GP Bari [S2.0] | 4 | A6GCS | Giorgio Scarlatti | | 3rd |
| 15.5.1955 | Bol d'Or | 5 | A6GCS | Monneret / Monneret | | DNF |
| 15.5.1955 | Bol d'Or | 6 | | Vidilles / Thépenier | Simone | raced |
| 15.5.1955 | Bol d'Or | 7 | A6GCS | Guyot / Parsy | | 3rd |
| 15.5.1955 | GP Bari [S2.0] | 8 | | Giuseppe Musso | | DNF |
| 15.5.1955 | GP Bari [S+2.0] | 10 | 300S | Luigi Musso | Officine Alfieri Maserati | 2nd |
| 15.5.1955 | GP Bari [S2.0] | 10 | A6GCS/53 | Gino Valenzano | | 4th |
| 15.5.1955 | SCCA National Cumberland [CM+DM+EM] | 10 | 300S | Bill Spear | W. C. Spear | 2nd |
| 15.5.1955 | GP Bari [S2.0] | 12 | A6GCS | Luigi Bellucci | | DNF |
| 15.5.1955 | GP Bari [S2.0] | 14 | A6GCS/53 | Cesare Perdisa | | 1st |
| 15.5.1955 | GP Bari [S2.0] | 18 | A6GCS/53 | Attilio Buffa | | 7th |
| 15.5.1955 | Bol d'Or | 19 | | Houel / Bosisto | | raced |
| 15.5.1955 | GP Bari [S2.0] | 22 | A6GCS | Osvaldo Lippi | | DNF |
| 15.5.1955 | GP Bari [S2.0] | 26 | A6GCS/53 | Maria Teresa de Filippis | | 5th |
| 15.5.1955 | GP Bari [S2.0] | 28 | | Giuseppe Rosati | | DNF |
| 15.5.1955 | SCCA National Cumberland [CM+DM+EM] | 30 | 300S | Cunningham | B. S. Cunningham | 4th |
| 15.5.1955 | GP Bari [S+2.0] | 30 | 300S | Roberto Mières | | DNF |
| 15.5.1955 | GP Bari [S2.0] | 32 | A6GCS/53 | Gaetano Starrabba | | 6th |
| 15.5.1955 | SCCA National Cumberland [CM+DM+EM] | 32 | 300S | Bill Lloyd | W. B. Lloyd | 3rd |
| 15.5.1955 | GP Bari [S2.0] | 34 | A6GCS/53 | Enzo Lopez | | 9th |
| 15.5.1955 | GP Bari [S+2.0] | 34 | 300S | Jean Behra | Maserati | 1st |
| 15.5.1955 | SCCA National Cumberland [CM+DM+EM] | 214 | A6GCS/53 | Tom Friedmann | T. A. Friedman | 7th |
| 15.5.1955 | SCCA National Cumberland [CM+DM+EM] | 283 | | Fritz Koster | | 6th |
| 21.5.1955 | Trofeo Sardo | 158 | A6GCS/53 | Gaetano Starrabba | | 1st |
| 22.5.1955 | Circuit de Dieppe | | A6GCS | Georges Houel | | 5th |
| 28.5.1955 | SMRC Snetterton [Formula Libre] | 89 | 250F | Roy Salvadori | Gilby Engineering | 1st |
| 28.5.1955 | SMRC Snetterton [Formula Libre] | 98 | 8CM | Nobby Spero | | 5th |
| 29.5.1955 | SCCA Regional Thompson [UR] | 7 | V8RI | Phil Cade | | 4th |
| 29.5.1955 | GP des Frontières | 10 | A6GCS/53 | Benoît Musy | | 1st |
| 29.5.1955 | Eifelrennen Nürburgring | 11 | 300S | | Officine Alfieri Maserati | DNA |
| 29.5.1955 | Eifelrennen Nürburgring | 16? | 150S | Jean Behra | | raced |
| 29.5.1955 | Eifelrennen Nürburgring | 17 | | | Officine Alfieri Maserati | DNA |
| 29.5.1955 | GP des Frontières | 18 | A6GCS/53 | André Loëns | | DNF |
| 29.5.1955 | GP des Frontières | 20 | A6GCS | Paul Delebarre | | DNA |
| 29.5.1955 | Eifelrennen Nürburgring | 28 | | | Officine Alfieri Maserati | DNA |
| 29.5.1955 | 12 h Hyères | 40 | | Vidilles / Thépenier | | DNF |
| 29.5.1955 | Supercortemaggiore | 64 | 300S | Valenzano / Bordoni | Officine Alfieri Maserati | DNF |
| 29.5.1955 | Supercortemaggiore | 68 | 300S | Behra / Musso | Officine Alfieri Maserati | 1st |
| 29.5.1955 | Supercortemaggiore | 70 | 300S | Mières / Perdisa | Officine Alfieri Maserati | 3rd |
| 29.5.1955 | Supercortemaggiore | 72 | A6GCS/53 | de Graffenried / Giardini | | DNF |
| 29.5.1955 | Supercortemaggiore | 74 | A6GCS/53 | Bellucci / Ruffo | | 6th |
| 29.5.1955 | Supercortemaggiore | 76 | A6GCS/53 | Valenzano / Pagliai | | 7th |
| 29.5.1955 | Supercortemaggiore | 78 | A6GCS/53 | Tomasi / de Filippis | | NC |
| 29.5.1955 | Supercortemaggiore | 82 | A6GCS/53 | Cabalén / Cacciari | | DNF |
| 29.5.1955 | Supercortemaggiore | 86 | A6GCS | Musso / Ribaldi | | NC |
| 29.5.1955 | Supercortemaggiore | 96 | A6GCS/53 | Bosisio / Della Beffa | | DNF |
| 29.5.1955 | Supercortemaggiore | 98 | A6GCS | Houel / Behra | | 12th |
| 29.5.1955 | Supercortemaggiore | 104 | A6GCS | Airaldi / Pagliarini | | DNF |
| 29.5.1955 | Supercortemaggiore | 106 | A6GCS | Manzini / Mejer | | DNF |
| 29.5.1955 | SCCA Regional Thompson [UR] | 123 | 300S | John Gordon Bennett | Bill Lloyd | NC |
| 29.5.1955 | SCCA Regional Thompson [CM+DM] | 123 | 300S | Bill Lloyd | Bill Lloyd | 1st |
| 29.5.1955 | SCCA Regional Thompson [EP+EM] | 283 | A6GCS | Fritz Koster | | 2nd |
| 30.5.1955 | Iowa [BM+CM+DM+EM+CP+DP+EP] | 32 | A6GCS/53 | Tom Friedmann | Tom Friedmann | 3rd |
| 30.5.1955 | Iowa [EM+FM+CP+DP+EP] | 32 | A6GCS/53 | Tom Friedmann | Tom Friedmann | 3rd |