Muilla is a genus of monocots in the family Asparagaceae. It includes four to five species of flowering plants.
The genus name is a taxonomic anagram of Allium (in fact, the letters are in exact reverse order), the onion genus, for the flowers' resemblance.
In the APG III classification system, it is placed in the family Asparagaceae, subfamily Brodiaeoideae. The subfamily has also been treated as a separate family Themidaceae.
Muilla species are native to southwestern North America.