The Alfa Romeo 183T was a Formula One car designed by Gérard Ducarouge and Mario Tollentino and was used by Marlboro Team Alfa Romeo during the 1983 Formula One season. The car, with a newly designed flat bottom, made its debut at the 1983 Brazilian Grand Prix. Running on French Michelins, the 183T was driven in 1983 by Italians Andrea de Cesaris and Mauro Baldi.

Unlike the preceding Alfa Romeo F1 cars, the 183T chassis was not designed by Alfa Romeo's Autodelta; instead Euroracing's chief engineer Gérard Ducarouge was the main designer (Ducarouge was fired by Alfa less than a month into the 1983 season and was quickly signed by Lotus). Euroracing had been earlier successful in Formula 3 with Alfa Romeo engines.

The 183T was basically an updated version of the teams 1982 car, the 182. Gone however was Alfa's 1260 V12 which had served the team since 1979. In its place was the 890T, a 1.5-liter turbocharged V8 engine (the 1260 engine was still used at the time by the Osella team). The change in engine gave the 183T a significant boost in power. The 1260 V12 was rated at 540 bhp (400 kW) while the turbocharged 890T was rated at 640 bhp (480 kW). However, this still fell short of the 850 bhp (630 kW) power figures quoted by for the turbocharged BMW, Renault and Ferrari engines. During the year the 890T's fuel consumption wasn't a factor as stops for fuel were permitted. From 1984 however, when the FIA imposed a 220-liter fuel limit on the cars and banned stops for fuel, the V8 engine's fuel consumption, plus its shortage of power would see Alfa wane as a Formula One front runner.

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