I received a W-2 from a place I worked in 2023. I was NOT employed by them, at all in 2024, but they sent me one anyways, why would that be?

Sometimes the wages at the very end of the year (last week or two) get slopped into the next year.....depending on their accounting procedures.  (but $$ amounts would have to seem reasonable of a week or 2 of pay)

Sometimes there are certain other funds that get paid out in the next year.   I received some $$ a full year and a half after I left the job, due to some incentive pay that only was issued that much later.  And the next Feb...got a W-2 for it.

There are a few possible reasons.

• You may have worked the last few weeks of 2023, and the pay period carried over into 2024.
• As SteanTrain said "Sometimes there are certain other funds that get paid out in the next year."
• Check to see if it was included on you 2023 tax return.
• It is a corrected 2023 W-2.  This will be listed as a W-2 G and it looks very different from your regular W-2.