Formal:
* Καλώς ορίσατε (Kalos orisate): This is the most formal way to say welcome and is used in official settings or when addressing someone you don't know well.
* Καλώς ήρθατε (Kalos irthate): Similar to "kalos orisate", but slightly less formal.
Informal:
* Καλώς ήρθες (Kalos irthes): This is used for one person and is the most common informal way to say welcome.
* Καλώς ήρθατε (Kalos irthate): This is used for multiple people and is also informal.
* Γεια σου (Ya sou): This means "hello" but can also be used as a casual way of saying welcome.
Other options:
* Χαίρομαι που σε γνωρίζω (Chairomai pou se gnorizo): "I'm glad to meet you" is another way to express welcome, especially in informal settings.
* Είμαι χαρούμενος/η που σε βλέπω (Eimai charoumenos/i pou se vlepo): "I'm happy to see you" can be used as a warm welcome.
The best way to say "welcome" in Greek depends on the situation and your relationship with the person you are greeting.