- Argentine Grand Prix
- Piquet ends Williams run
April 12, 1981: Williams' dominance of the first two rounds was ended by Nelson Piquet's victory in Buenos Aires, his success angering a highly partisan crowd who had come in the expectation that Carlos Reutemann would record a second successive win
- Brazilian Grand Prix
- Reutemann heads another Williams 1-2
March 29, 1981: The second race of the season produced another Williams 1-2, although the order was reversed with Carlos Reutemann taking the win from team-mate and defending champion Alan Jones.
- Showing 1-2