Can I fix a leaking pool skimmer without replacing the whole thing?

Yes, in most cases. The most common leak points are the gasket between the faceplate and the pool wall, or the threaded pipe fitting—both are cheap and easy fixes. Replace the gasket (under $10) or try a new O-ring or PVC joint compound. Only replace the whole skimmer if the housing is cracked beyond epoxy repair or threads are stripped, which is rare.