How can I retrieve my lost/stolen Apple Pencil ?

Then you are going to have to get a new one if you want to use an Apple Pencil with your iPad. If it is lost or stolen, there is nothing you can do to retrieve it, other than going back to where it was lost and seeing if it is still there. It will NOT show up in Find My as it is not associated with your AppleID. Therefore if it is lost or stolen, it is gone.

Sorry, I know this probably isn’t the news you wanted to hear, but unfortunately it is how it is.

Melanie289m wrote:

I lost my Apple Pencil two weeks ago but then I found a Apple Pencil and I tried to see if it was mine but it’s not and I don’t know how to look if it’s mine

Unless you have an Apple Pencil Pro - compatible with the 2024 iPads Air M2 and Pro M4 - an Apple Pencil cannot be located using Apple's Find My service.

Unless your Apple Pencil has unique external markings, such as engraving, the are no visible external means with which to identify a Pencil or its ownership.

If you still have the original box within which your Pencil was supplied, the Pencil's serial number is printed on a label affixed to the box. This information might be used to compare with the serial number as reported by an iPad to which the Pencil is paired - and this used to demonstrate a Pencil's ownership:

Settings > General > About > Apple Pencil > Serial Number

Apple Pencil is never associated with an Apple ID and therefore not visible in Find My.

Assuming the pencil you found is a 2nd gen pencil, USB-C, or (which I doubt applies to your situation) the Pencil Pro you can find the serial number on the actual pencil inside the tip area or on the 1st gen pencil on the lightening connector.

Find the serial number of your Apple Pencil - Apple Support

But if it’s not pairing to your iPad and it’s the iPad it was originally used with it’s likely not yours.

I lost my Apple Pencil two weeks ago but then I found a Apple Pencil and I tried to see if it was mine but it’s not and I don’t know how to look if it’s mine