Google Translate gives C'est ton tour. Is this what you would use, when telling a friend it's his turn in a game? To give an example, I'm playing a friend in Words with Friends (a lot like Scrabble) and I would like to say to him, "It's your turn".
Here is a couple of common ways to say it:
[C'est] à toi
C'est à ton tour [de jouer]
Dropping the à is possible too:
- C'est ton tour
Here is, as I discovered thanks to your very question, quite a localized one:
- Ça vient à toi (Marseille area only!)
To answer to your first comment, note that à mon/ton/son tour is an old "set expression".
Quoted from: Curiositez françoises pour supplément aux dictionnaires Antoine Oudin, 1640