A wallet holds two distinct kinds of value — money (resources) and ID (identity) — so losing one in a dream tends to combine both anxieties: worry about your resources and about how you're recognised or defined.
Losing your wallet with cash inside
If the dream emphasises the money specifically, it usually points more directly to financial anxiety — a real or anticipated resource concern.
Losing your wallet with your ID inside
If identification is the focus, it often reflects a broader identity anxiety — feeling unrecognised, or worried about how you're perceived or defined by others right now.
Someone stealing your wallet
Can reflect a feeling that resources or recognition you've earned are being unfairly taken from you — worth examining if there's a real situation where you feel undervalued or shortchanged.