The 2005 Monaco Grand Prix was a Formula One motor race held on 22 May 2005 at the Circuit de Monaco in Monte Carlo. It was the sixth race of the 2005 Formula One World Championship.

The race was won from pole position by Finnish driver Kimi Räikkönen, driving a McLaren-Mercedes. German Nick Heidfeld finished second in a Williams-BMW with his teammate, Australian Mark Webber, achieving his first F1 podium finish in third. Drivers' Championship leader, Spaniard Fernando Alonso, finished fourth in his Renault.