1955 Avon Trophy

{{Infobox Grand Prix race report

|Image = Castle Combe Circuit track map.svg

|Type = NC

|Country = UK

|Grand Prix = Avon Trophy

|GP_Suffix =

|Official name = I Avon Trophy

|Location = Castle Combe Circuit, Wilts.

|Date = 1 October

|Year = 1955

|Course = Permanent racing facility

|Course_mi = 1.84

|Course_km = 2.961

|Distance_laps = 55

|Distance_mi = 101.2

|Distance_km = 162.831

|Weather =

|Pole_Driver = Harry Schell

|Pole_Country = USA

|Pole_flag_suffix = 1912

|Pole_Team = Vanwall

|Pole_Time = 1:14.4

|Fast_Driver = Harry Schell

|Fast_Team = Vanwall

|Fast_Time = 1:13.6

|Fast_Country = USA

|Fast_flag_suffix = 1912

|First_Driver = Harry Schell

|First_Country = USA

|First_flag_suffix = 1912

|First_Team = Vanwall

|Second_Driver = Horace Gould

|Second_Country = UK

|Second_Team = Maserati

|Third_Driver = Bob Gerard

|Third_Country = UK

|Third_Team = Cooper-Bristol

}}

The I Avon Trophy was a non-championship Grand Prix which was held at the Castle Combe Circuit on 1 October 1955, three weeks after the end of the season. It was the inaugural running of the Avon Trophy, and the last race run to Formula One regulations to be held at the circuit.

The race was won from pole by American, Harry Schell, ahead of privateer Horace Gould, in second and Bob Gerard in third.