Reflecting more Lamphun’s historical significance than the town’s current size and influence, it’s rather good as far as provincial museums go.
The display is split into three sections, with a ground floor room housing stone (mostly Mon) inscriptions, a first floor section with Buddhas and statues from local wats and a separate building concentrating more on Mon and Lanna cultural artifacts. Many though not all the items have bilingual labels.
This is nothing earth shattering but worth a look if you are in town with 30 or 40 minutes to spare.
There is a 100 baht entrance fee for foreignera and though no flash photography is allowed you can take your camera.