My son will IYH be making a Siyum on the day of his Bar Mitzvah. Can he say Kaddish?


If he learnt the mesechta/seder as a katan, and finishes as a gadol (on his Bar Mitzvah day) is Kaddish recited afterwards?



Yes, if there’ll be a Minyan present, See also here.

The Kaddish to be said is a regular Kaddish Derabanan – see here and here.

If there will be someone with a Chiuv present, the custom is that they say the Kaddish. Otherwise, the one who makes the Siyum says it. If he is a minor before his Bar Mitzvah, an adult should say it (although a minor may technically say Kaddish as done by yesomim. See here).