(Entry List)
| No. | Drivers | Entrant | Principal | Make | Type | Model | Engine | Gr. |
| 1 | Siffert / van Lennep | J. W. Automotive Engineering (GB) | | Porsche | 917 | K | Porsche | S |
| 2 | Bell / Attwood | J. W. Automotive Engineering (GB) | | Porsche | 917 | K | Porsche | S |
| 5 | Duval / Nicholas | Jacques Duval (CDN) | Jacques Duval | Porsche | 914 | /6 | Porsche | GT2.5 |
| 6 | Donohue / Hobbs | Roger Penske/Kirk F. White (USA) | | Ferrari | 512 M | | Ferrari | S |
| 12 | Conrad / Caldwell | Ralph Meaney (USA) | | Porsche | 914 | /6 | Porsche | GT2.5 |
| 14 | Posey / Bucknum | North American Racing Team (USA) | | Ferrari | 512 M | | Ferrari | S |
| 16 | Keyser / Jennings | Toad Hall Racing (USA) | Michael Keyser | Porsche | 911 | T | Porsche | GT2.5 |
| 21 | Young / Adams | Young American Racing Team (USA) | Gregg Young | Ferrari | 512 M | | Ferrari | S |
| 30 | de Adamich / Peterson | Autodelta S.p.A. (I) | | Alfa Romeo | T33/3 | | Alfa Romeo | P |
| 31 | Everett / Beasley | Locke Development Corporation (USA) | | Porsche | 911 | T | Porsche | GT2.5 |
| 32 | Locke / Bailey | Locke Development Corporation (USA) | James Locke | Porsche | 911 | S | Porsche | GT2.5 |
| 33 | Pescarolo / Stommelen | Autodelta S.p.A. (I) | | Alfa Romeo | T33/3 | | Alfa Romeo | P |
| 35 | Elford / Galli | Autodelta S.p.A. (I) | | Alfa Romeo | T33/TT/3 | | Alfa Romeo | P |
| 36 | Galli / Elford / *de Adamich | Autodelta S.p.A. (I) | | Alfa Romeo | T33/3 | | Alfa Romeo | P |
| 37 | Oest / Tillson | Holbert/Oest (USA) | | Porsche | 911 | | Porsche | GT2.5 |
| 40 | Ickx / Andretti | S.p.A. Ferrari SEFAC (I) | | Ferrari | 312 PB | | Ferrari | P |
| 41 | Schumacher / McClure / Kiefer | Iroquois Racing Associates (USA) | | Chevrolet | Corvette | | Chevrolet | GT+2.5 |
| 43 | Adamowicz / Cabral | David Piper Racing (GB) | David Piper | Porsche | 917 | K | Porsche | S |
| 46 | Rahal / Wise / Kroll | Brokers Racing/Nationwide Food | | Porsche | 906 | K | Porsche | S |
| 48 | Müller / Eaton | Herbert Müller Racing (CH) | Herbert Müller | Ferrari | 512 M | | Ferrari | S |
| 49 | Johnson / Greenwood | John Greenwood Racing (USA) | | Chevrolet | Corvette | | Chevrolet | GT+2.5 |
| 50 | Hoffman / Cipelle / Greenwood | John Greenwood Racing (USA) | | Chevrolet | Corvette | | Chevrolet | GT+2.5 |
| 57 | Heinz / Yenko | Or Costanzo/Tri City Corvette Club (USA) | | Chevrolet | Corvette | | Chevrolet | GT+2.5 |
| 59 | Gregg / Haywood | Brumos Porsche-Audi (USA) | | Porsche | 914 | /6 | Porsche | GT2.5 |
| 60 | Ormes / Brown / Bondurant | Bahamas Racing (GB) | | Lola | T70 | Mk.3B GT | Chevrolet | S |
| 61 | Kleinpeter / Belcher | Promotional Advertising (USA) | Hugh Kleinpeter | Lola | T212 | | Ford | P |
| 63 | De Cadenet / Motschenbacher | Ecurie Francorchamps (B) | | Ferrari | 512 M | | Ferrari | S |
| 64 | Baechle / Summers / Kepler | Bob Baechle (USA) | | Chevrolet | Corvette | | Chevrolet | GT+2.5 |
| 67 | Harrison / Fraser / Rinzler / Barber | Baker Motor Co. (USA) | Jim Baker | Lola | T212 | | Ford | P |
| 68 | Keating / Pentecost / Torgersen | Baker Motor Co. | | Porsche | 911 | S | Porsche | GT2.5 |
| 70 | Kremer / Durant | Kremer Racing (D) | Erwin Kremer | Porsche | 911 | S | Porsche | GT2.5 |
| 80 | Minter / Bartling / Hochreuter | Fritz Hochreuter (CDN) | | Porsche | 911 | | Porsche | GT2.5 |
| 87 | Dean / Matchett / Parsons | A. G. Dean (Racing) (GB) | | Porsche | 908/02 | | Porsche | P |
| 91 | Luebbe / Orr | Robert Luebbe | | Chevrolet | Corvette | | Chevrolet | GT+2.5 |
| T | Siffert / van Lennep / Bell / Attwood | J. W. Automotive Engineering (GB) | | Porsche | 917 | K | Porsche | S |
Entered cars that did not arrive:
| No. | Drivers | Entrant | Principal | Make | Type | Model | Engine | Gr. |
| 3 | Jo Bonnier | Scuderia Filipinetti (CH) | | Lola | T212 | | Ford | P |
| 10 | Behr / Wright | Ralph Meaney (USA) | Ralph Meaney | Porsche | 914 | /6 | Porsche | GT2.5 |
| 11 | Cowell / Jenkins / Conrad | Ralph Meaney | | Porsche | 914 | /6 | Porsche | GT2.5 |
| 13 | Glanton / Alden | Jim Glanton | | Porsche | 911 | S | Porsche | GT2.5 |
| 18 | Paul / Harris | Es-Pa Racing | | Chevrolet | Corvette | | Chevrolet | GT+2.5 |
| 22 | Baumgartner / Herman | Don A. Baumgartner | | Chevron | B8 | | BMW | S |
| 45 | Guillermo Ortega | Guillermo Ortega (EC) | | Porsche | 908/02 | | Porsche | P |
| 53 | Dumoing / Cerruti | Georges Dumoing | | Lola | T212 | | Ford | P |
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