No, you do not need a passport to take the ferry to the Isle of Wight if you are a British or Irish citizen, as the island is part of the United Kingdom and falls within the Common Travel Area. However, ferry operators like Wightlink and Red Funnel do require you to carry a valid form of photographic identification. This is used to verify your booking and ensure passenger safety. Acceptable forms of ID typically include a UK driving license, a citizen card, or an expired passport (if the photo still looks like you). If you are an international traveler visiting the UK, it is highly recommended to carry your passport regardless, as it remains the most universally accepted document if you encounter any issues. It is also worth noting that while you don't need a passport for the crossing itself, you will need your booking confirmation number (either digital or printed) to board, as the ferries can be extremely busy and operate on a strict manifest system in 2026.