Spot gold rose 0.4% to $4,080.38 per ounce on Thursday.
U.S. gold futures gained 1.1% to reach $4,078.
The Federal Reserve maintained interest rates between 3.5% and 3.75%.
Chairman Kevin Warsh affirmed a strong commitment to controlling inflation, creating policy uncertainty.
Three of the twelve voting committee members dissented in favor of a rate hike.
Escalating Middle East tensions and surging oil prices increased gold's safe-haven appeal.
Investors are monitoring upcoming Personal Consumption Expenditures (PCE) data for further policy clues.