| Type: | CUST |
| Description: | Race 3 of 6 in 1966 Can-Am season |
| Grand Prix: | Canadian |
| Country: | Canada |
| Location: | Mosport Park, Bowmanville, Ontario, Canada |
| Date: | September 24 |
| Year: | 1966 |
| Course: | Permanent racing facility |
| Course Km: | 3.95 |
| Distance Laps: | 88 |
| Distance Km: | 336 |
| Weather: | Cold with temperatures approaching 13.9C; wind speeds up to 18.1km/h[1] |
| Pole Driver: | Dan Gurney |
| Pole Country: | USA |
| Pole Team: | Lola-Ford |
| Pole Time: | 1:50.7 |
| Fast Driver: | Dan Gurney |
| Fast Team: | Lola-Ford |
| Fast Time: | 1:23.1 |
| Fast Country: | USA |
| First Driver: | Mark Donohue |
| First Country: | USA |
| First Team: | Lola-Chevrolet |
| Second Driver: | Phil Hill |
| Second Country: | USA |
| Second Team: | Chaparral-Chevrolet |
| Third Driver: | Chuck Parsons |
| Third Country: | USA |
| Third Team: | McLaren-Chevrolet |
The 1966 Canadian Grand Prix was a motor race held at Mosport Park on September 24, 1966, held for sports cars eligible to Can-Am Series regulations and had 30 starters. It was the sixth Canadian Grand Prix and like all previous races was a sports car race. The race doubled as round three of the 1966 Can-Am Series. The race was won by Penske driver Mark Donohue by two laps over Chaparral driver Phil Hill.
Results as follows:[2] [3] [4]
| Pos | No. | Driver | Team | Car | Laps | Time | Points |
|---|---|---|---|---|---|---|---|
| 1 | 6 |  Mark Donohue | Roger Penske Racing Enterprises | Lola T70 / Chevrolet | 85 | 2h 03m 09.2s | 9 |
| 2 | 65 | Phil Hill | Chaparral Cars | Chaparral 2E / Chevrolet | 83 | 6 | |
| 3 | 10 | Chuck Parsons | Hilton Racing Team | McLaren M1B / Chevrolet | 82 | 4 | |
| 4 | 99 | Earl Jones | Charles Hayes Racing | McLaren M1B / Chevrolet | 80 | 3 | |
| 5 | 11 |  Paul Hawkins | Epstein Enterprises Ltd. | Lola T70 Mk.II / Chevrolet | 79 | 2 | |
| 6 | 94 |  Eppie Wietzes | Comstock Racing Team | Ford GT40 | 78 | 1 | |
| 7 | 53 | Hugh Dibley | Racing Partners | Lola T70 Mk.II / Chevrolet | 77 | ||
| 8 | 00 | Bobby Brown | Lola T70 Mk.II / Chevrolet | 74 | |||
| 9 | 52 | Bill Eve | Eve & Jones Racing | Genie Mk.10 / Ford | 70 | ||
| 10 | 88 | Masten Gregory | Pacesetter Homes | McLaren M1B / Chevrolet | 68 | ||
| 11 | 86 | Mike Goth | Mike Goth Racing | McLaren Goth Special / Chevrolet | 65 | ||
| DNF | 30 | Dan Gurney | All American Racers | Lola T70 / Ford | 75 | Ignition | |
| DNF | 5 |  Chris Amon | Bruce McLaren Motor Racing Ltd. | McLaren M1B / Chevrolet | 66 | Suspension | |
| DNF | 61 | Bud Morley | McLaren M1B / Ford | 63 | Engine | ||
| DNF | 38 | Dick Brown | Ecurie Green Inc. | McLaren M1B / Ford | 60 | ||
| DNF | 81 | Denny Hulme | Sidney Taylor Racing | Lola T70 / Chevrolet | 56 | Transmission | |
| DNF | 39 | Ludwig Heimrath | McLaren M1B / Ford | 54 | Suspension | ||
| DNF | 4 | Bruce McLaren | Bruce McLaren Motor Racing Ltd. | McLaren M1B / Chevrolet | 41 | Suspension | |
| DNF | 77 | Mak Kronn | John W. Fritsch | McKee Mk.6 / Chevrolet | 40 | ||
| DNF | 33 | Sam Posey | Autodynamics Corporation | McLaren M1B / Ford | 28 | ||
| DNF | 66 | Jim Hall | Chaparral Cars | Chaparral 2E / Chevrolet | 13 | Engine | |
| DNF | 29 | Bob Bucher | Young B.A.R.F. Inc. Racing Team | Lola T70 / Ford | 10 | Transmission | |
| DNF | 97 | Charlie Hayes | Nickey Chevrolet | McLaren M1B / Chevrolet | 10 | Accident | |
| DNF | 60 | Ed Hamill | Hamill Cars Inc. | Hamill SR3 / Chevrolet | 8 | ||
| DNF | 62 | John Cannon | Ecurie Carabine | McLaren M1B / Chevrolet | 5 | Fuel leak | |
| DNF | 57 | John Cordts | David Billes | McLaren M1A / Chevrolet | 3 | ||
| DNF | 96 | Lothar Motschenbacher | Dan Blocker Motor Racing | Genie Vinegaroon / Oldsmobile | 1 | Accident | |
| DNF | 7 | John Surtees | Team Surtees | Lola T70 Mk.II / Chevrolet | 1 | Accident | |
| DNF | 19 | Skip Scott | Drummond Racing Organisation | McLaren M1B / Ford | 1 | Accident | |
| DNF | 23 | Brett Lunger | Alderman Auto Service | Lola T70 / Ford | 1 | Accident | |
| DNS | 16 | George Follmer | John W. Mecom, Jr. | Lola T70 / Ford | |||
| DNS | 8 | Jerry Grant | All American Racers | Lola T70 / Ford | Accident | ||