Short answer: No. Hungary is an EU member but not in the Eurozone. The official currency is the Hungarian Forint (HUF). Euros are not legal tender.
Don't rely on it. Always carry forints.
Best rates: ATMs (use bank-affiliated: OTP, K&H, Erste, Raiffeisen, CIB). Decline DCC (Dynamic Currency Conversion) — choose "charge in HUF."
Good rates: Currency exchange offices in city centers (avoid airports/train stations). Compare posted rates.
Worst rates: Airport kiosks, hotel front desks, street changers.
Contactless cards widely accepted (Visa, Mastercard, Amex less so). Apple/Google Pay common. Minimum spend sometimes 1,000–2,000 HUF (~$3–5). Notify bank of travel.
Notes: 500, 1,000, 2,000, 5,000, 10,000, 20,000 HUF. Coins: 5, 10, 20, 50, 100, 200 HUF. ~370 HUF = 1 USD (2024). No subunit in daily use (fillér obsolete).
Hungary committed to eventual euro adoption (EU treaty) but no target date. Requires meeting convergence criteria (inflation, deficit, debt, exchange rate stability). Public opinion skeptical. Forint stays — for now.
Bring a no-foreign-transaction-fee card, hit an ATM on arrival, pay in forints. Simple.