Is it safe to wear an Apple Watch 9 with a pacemaker?

Depends on the Pacemaker.

Some may allow it, some may not.

You will need to ask your doctor / cardiologist about it and review the pacemaker guidelines you were given when it was implanted.

scoz34 wrote:

Thankyou everyone for your replies, I have managed to contact pacemaker manufacturer who has assured me it’s safe.

So glad it worked out for you!

When you got your pacemaker, you should have received a card to keep in your wallet. There should be a support phone number on that card. Call them to see what they think. I don't have a pacemaker, but I have a spinal cord stimulator with the paddles in my upper neck. I was told it was safe for me to wear an Apple Watch. Your company may approve it but with guidelines such as, do not put your watch or iPhone in a shirt pocket or around your neck. But you should seek their advice.

scoz34 wrote:

Thankyou everyone for your replies, I have managed to contact pacemaker manufacturer who has assured me it’s safe.

You're welcome. Glad the manufacturer was able to advise positively.

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no matter what then if it was me then I would double check what my doctor says, seeking medical advice from strangers on the internet may not always be wise.