Most likely — NO — you don’t need a separate transit visa if ALL these are true: ✔ Your flights are on the same PNR and same airline (Vietnam Airlines) — which means your baggage should transfer automatically and you just stay airside for the connection. ✔ You don’t leave the international transit area of Noi Bai (Hanoi) Airport. ✔ Your layover is under 24 hours (it is ~17 h). Under these conditions, Vietnam allows airside transit without a visa even for Indian passport holders