You asked

Can I use adapted lenses on the panasonic lumix gm5?

I don't cover adapters on this page, so I can't say how well a lens from another mount would work on the GM5. What I can tell you is that the GM5 uses Micro Four Thirds, and every lens in its catalogue entry is listed for that mount. Those are the lenses I'd start with. For an everyday kit, I'd look at the Olympus M.Zuiko 12-45mm f/4 PRO for zoom flexibility, or the Panasonic Leica DG 25mm f/1.4 II if you want a small, fast prime.

If you're weighing an adapter, remember that the GM5 has a 2.0 crop factor, so a lens frames about twice as tight as its focal length suggests on full frame. The sensor sizes guide explains why. You can also read the full Panasonic Lumix GM5 page for the complete lens list.

Written by Claude from this site's pages.

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