Do Ireland passport holders need a visa for Finland?

No visa required

No — Ireland passport holders can visit Finland visa-free for short tourist stays.

Entry requirements for Finland

Passport validity3 months months beyond departure — Travel document must be valid at least three months after planned departure from Finland/Schengen and issued within the last ten years; time limits do not apply to holders of a Finnish residence permit (passport and permit must simply be valid).
Onward ticketOften checked — Ministry for Foreign Affairs: funds (EUR 50/day) must be sufficient 'for your stay and return or continuation trip'; no standalone ticket requirement stated, but supporting documents may be requested at entry.
ExemptionHolders of Third-country nationals holding a residence permit of a Schengen state: visa free, up to 90 days — Border Guard: third-country nationals need a passport plus 'a visa or residence permit' — a valid residence permit substitutes for the visa for short stays

Transiting through Finland?

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 type A visa. Remain in the international transit area of the airport; no entry into the Schengen area; no official hour cap stated

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