Art museums are some of the largest buildings in the world. The world's most pre-eminent museums have also engaged in various expansion projects through the years, expanding their total exhibition space.
The following is a list of art museums ranked according to their gallery space where published by reliable sources. Only museums with more than of gallery space are included.
The following is a list of art museums projected to offer at least of gallery space in the future or increase their current gallery space, following construction, expansion, or renovation.