Oscar Rubén Larrauri (born 19 August 1954) is a racing driver from Argentina.

Brun Motorsport formed an alliance with Giampaolo Pavanello's Euroracing team who had previously run the factory backed Alfa Romeo team from 1982-1985.

The EuroBrun ER188, powered by the 590 bhp (440 kW; 598 PS) Cosworth DFZ V8 engine, proved to be one of the slowest cars in its debut season with Larrauri in particular gaining an unwanted reputation as a mobile road block in the René Arnoux mould (i.e. one who rarely used his mirrors and often held up faster cars from lapping him, and even getting in the way during qualifying runs).

With a lack of results coming, Brun actually looked to replace the Argentine in mid-season, but no driver was available who could fit into the car and Larrauri was retained for the rest of the season.

Without a drive at the start of 1989, Larrauri only entered in the last five Grands Prix of the season, again with EuroBrun, though he failed to pre-qualify on each occasion bringing an end to his brief Formula One career.