Do Denmark passport holders need a visa for Belgium?

No visa required

No — Denmark passport holders can visit Belgium visa-free for short tourist stays.

Entry requirements for Belgium

Passport validity3 months months beyond departure — Schengen Borders Code art. 6(1)(a): travel document valid at least 3 months after intended departure from the member states (waivable in justified emergency) and issued within the previous 10 years.
Onward ticketOften checked — SBC art. 6(1)(c): must have sufficient means of subsistence for the stay and for the return (or transit to a third country with assured admission); Belgium sets EUR 45/day (staying with relatives/friends) or EUR 95/day (hotel). Guarantees of return may be required.
ExemptionHolders of Third-country nationals holding a valid residence permit or a valid long-stay (D) visa of a Schengen member state: visa free, up to 90 days — SBC art. 6(1)(b): short-stay visa requirement does not apply to holders of a valid residence permit or long-stay visa; 90 days in any 180-day period

Transiting through Belgium?

Schengen airport transit (type A visa regime)Up to nullh — Most nationalities may transit airside without a visa; nationals on the EU airport transit visa list require a Belgian type A airport transit visa. Remain in the international transit area of the airport; a type A visa does not permit entry into the Schengen area; no official hour cap stated

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