The March CG891 was a Formula One racing car designed by Gustav Brunner and Adrian Newey and raced by March Racing Team in the 1989 season by Ivan Capelli and Maurício Gugelmin. The car's best result was seventh place, achieved three times by Gugelmin. The CG in the car's designation stood for Cesare Gariboldi, a Leyton House March team manager who was killed in a road accident in 1989.

The March CG891 was introduced at the Monaco Grand Prix, the March 881 having served duty for the first two races of the year. Gugelmin qualified in 14th while Capelli was 22nd on the grid. Both drivers failed finish although Capelli was still classified in 11th. This was the Italian's first of only two classified finishes all year, the other coming in Belgium, where he placed 12th. Gugelmin's best finish was seventh, achieved three times; in Belgium, Japan and 1989 Australian Grand Prix.

At the French Grand Prix, after a start-line accident forced Gugelmin to use the spare car for the race, he went on to achieve the fastest lap of the race.

Although neither Gugelmin or Capelli scored a points finish with the GC891, the team finished the 1989 Constructors' Championship in 12th, having achieved four points. This was due to Gugelmin's third place with the 881 at the Brazilian Grand Prix.

() (Results in bold indicate pole position; results in italics indicate fastest lap)

* All four points for 1989 were scored with the 881

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