How do I locate a lost Apple Watch?

Here are some things you can do to find your Apple Watch

• Open the Find My app on your iPhone.
• Tap on the Devices tab.
• Select your Apple Watch from the list to see it's last known location.
• Swipe down on your iPhone screen to access the Notification Center for any location notifications.
• Ask family and friends if they have seen or moved it.
• Retrace your steps to see if you might have left it somewhere.
• Mark your Apple Watch as lost in the Find My app to lock it with a passcode and display your contact information.
• Contact Apple Support for further assistance if needed.
• Check unexpected places like between couch cushions or in your car.

if you enabled it then you can always use a computer browser to find it by going to www.icloud.com

if you did not enable it then you can't track it

Click here and follow the instructions; in addition, post notices around where the watch got lost, and if applicable, contact the Lost & Found department of the facility involved.

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click on the blue text that say "here" and go to page and read the desciptions

I lost my Apple Watch two days ago, but my iPad and iPhone don’t have my Finder on it.