1985 British motorcycle Grand Prix

{{Short description|Motorsports competition}}

{{Use dmy dates|date=April 2022}}

{{Infobox Grand Prix motorcycle race report

| Grand Prix = British

| flag = United Kingdom

| Official_Name = Marlboro British Grand Prix{{cite web|url=http://www.jumpingjack.nl/GP-races_1985_heden.htm|archiveurl=https://archive.today/20150725161036/http://www.jumpingjack.nl/GP-races_1985_heden.htm|url-status=dead|title=Grand Prix uitslagen en bijzonderheden 1985|date=25 July 2015|archivedate=25 July 2015|website=Archive.today|accessdate=10 June 2018}}{{cite web|url=http://www.progcovers.com/motor/500cc1985.html|title=1985 500cc Class (FIM Grand Prix World Championship) Programmes - The Motor Racing Programme Covers Project|first=Malcolm|last=Mitchell|website=www.progcovers.com}}{{cite web|url=http://www.progcovers.com/motor/silverstone.html|title=Silverstone Circuit - The Motor Racing Programme Covers Project|first=Malcolm|last=Mitchell|website=Progcovers.com|accessdate=10 June 2018}}

| Location = Silverstone Circuit

| Image = Silverstone Circuit 1952 to 1974.png

| Course_mi = 2.927

| Course_km = 4.711

| Race_No = 10

| Season_No = 12

| Date = 4 August

| Year = 1985

| Pole_Rider_500 = Freddie Spencer

| Pole_Rider_500_Country = USA

| Pole_Time_500 = 1:28.420

| Fast_Rider_500 = Freddie Spencer

| Fast_Rider_500_Country = USA

| Fast_Time_500 = 1:43.530

| First_Rider_500 = Freddie Spencer

| First_Rider_500_Country = USA

| Second_Rider_500 = Eddie Lawson

| Second_Rider_500_Country = USA

| Third_Rider_500 = Christian Sarron

| Third_Rider_500_Country = FRA

| Pole_Rider_250 = Carlos Lavado

| Pole_Rider_250_Country = VEN

| Pole_Time_250 = 1:32.780

| Fast_Rider_250 = Manfred Herweh

| Fast_Rider_250_Country = BRD

| Fast_Time_250 = 1:46.780

| First_Rider_250 = Anton Mang

| First_Rider_250_Country = BRD

| Second_Rider_250 = Reinhold Roth

| Second_Rider_250_Country = BRD

| Third_Rider_250 = Manfred Herweh

| Third_Rider_250_Country = BRD

| Pole_Rider_125 = Ezio Gianola

| Pole_Rider_125_Country = ITA

| Pole_Time_125 = 1:39.600

| Fast_Rider_125 = August Auinger

| Fast_Rider_125_Country = AUT

| Fast_Time_125 = 1:53.950

| First_Rider_125 = August Auinger

| First_Rider_125_Country = AUT

| Second_Rider_125 = Pier Paolo Bianchi

| Second_Rider_125_Country = ITA

| Third_Rider_125 = Jean-Claude Selini

| Third_Rider_125_Country = FRA

| Pole_Rider_80 = No 80cc was held

| Pole_Rider_80_Country =

| Pole_Time_80 =

| Fast_Rider_80 = No 80cc was held

| Fast_Rider_80_Country =

| First_Rider_80 = No 80cc was held

| First_Rider_80_Country =

| Second_Rider_80 = No 80cc was held

| Second_Rider_80_Country =

| Third_Rider_80 = No 80cc was held

| Third_Rider_80_Country =

}}

The 1985 British motorcycle Grand Prix was the tenth round of the 1985 Grand Prix motorcycle racing season. It took place on the weekend of 2–4 August 1985 at the Silverstone Circuit.