Gainsborough Old Hall won the Inspiration Award for Best Special Project at the Lincolnshire Heritage Awards.
The trophy, won jointly with Lincolnshire County Council, was for the reinterpretation of the hall, which has recently had new rooms opened up to the public.
The awards were organised by the Lincolnshire Heritage Forum and funded through a grant from the Arts Council as part of the Museum Development East Midlands programme.
Anita Hollinshead, Museum Development Officer (Derbyshire & Lincolnshire), said: “The ceremony was a brilliant opportunity to showcase and celebrate all the fabulous and innovative work taking place in museums across Lincolnshire.”
“It demonstrated how lucky we are to have such amazing and diverse heritage attractions on our doorstep.”