Is kissing on the cheek when greeting polite in Germany?

Reserved for close friends. In Germany, cheek kissing is not a standard greeting in social gatherings; it is typically reserved for close friends and family, and even then often limited to one or two kisses. Among acquaintances or at casual parties, a firm handshake or a nod with a smile is more common and avoids awkwardness. Overstepping this boundary can be perceived as overly familiar or intrusive.

When in doubt, extend your hand for a handshake and follow the other person's lead on physical contact.

In southern Germany (Bavaria, Baden-Württemberg) and among younger, more cosmopolitan crowds, cheek kissing is slightly more accepted, but still not universal.