Brent crude prices climbed above $90 a barrel in early Asian trading on Monday, marking the highest level for the benchmark since mid-June.
The sharp move higher reflects intensifying market anxiety over the escalating military conflict between the United States and Iran.
The price surge follows a weekend of heightened rhetoric, with Tehran vowing to target regional infrastructure if President Donald Trump proceeds with previously threatened actions.
This development adds to the pressure on energy markets, which have been volatile throughout the week as traders assess the risk of supply disruptions.
Oil prices had already climbed on Friday as markets digested the latest escalation in tensions.
The conflict has been a dominant theme for global financial markets, with Brent crude climbing sharply on Wednesday after reports of new US air strikes.