Do Germany passport holders need a visa to visit CZ?

No. A German passport holder does NOT need a visa to visit Czechia. Both countries are EU members and part of the Schengen Area, so Germans travel freely under EU freedom of movement with no stay limit and no ETIAS required. Germany and Czechia are both European Union member states and full members of the Schengen Area. As an EU citizen, a German ordinary passport holder enjoys the right to free movement: no visa, no entry permit, and no Schengen 90/180 short-stay limit applies. You can enter Czechia with a valid German passport or national ID card and stay for tourism, business, or any short visit without registration for stays under 90 days. The Schengen 90/180 rule and the upcoming ETIAS travel authorisation apply only to visa-exempt NON-EU nationals (such as UK, US, or Canadian travellers), not to EU citizens. There are normally no border checks between Germany and Czechia, though temporary internal border controls can be reintroduced and you should always carry valid photo ID. If you intend to stay longer than 90 days, you simply register your residence with the Czech authorities under EU free-movement rules - no visa is involved.