Menominee (/mɪˈnɒmɪniː/ mih-NOM-ih-nee), also spelled Menomini (endonym: omāēqnomenēweqnaesen) is a critically endangered Algonquian language spoken by the Menominee people of what is now northern Wisconsin in the United States. The federally recognized tribe has been working to encourage revival of use of the language by intensive classes locally and partnerships with universities. Most of the fluent speakers are elderly. Many of the people use English as their first language.

The name of the tribe, and the language, derived from Oma͞eqnomenew, comes from the word for 'wild rice'. The tribe has gathered and cultivated this native food as a staple for millennia. The Ojibwa, their neighbors to the north who are one of the Anishinaabe peoples and also speak an Algonquian language, also use this term for them. The language is called omāēqnomenēweqnaesen but also omāēqnomenēweqnaesewen or omāēqnomenēw kīketwan

The main characteristics of Menominee, as compared to other Algonquian languages, are its extensive use of the low front vowel /æ/, its rich negation morphology, and its lexicon. Some scholars (notably Bloomfield and Sapir) have classified it as a Central Algonquian language based on its phonology.

Good sources of information on the Menominee tribe and their language include Leonard Bloomfield's 1928 bilingual text collection, his 1962 grammar (considered a landmark study), and Skinner's earlier anthropological work.

Menominee is a highly endangered language, as there are only a handful of fluent speakers left. According to a 1997 report by the Menominee Historic Preservation Office, 39 people spoke Menominee as their first language, all of whom were elderly; 26 spoke it as their second language; and 65 others had learned some of it for the purpose of understanding the language and/or teaching it to others.

The Menominee Language & Culture Commission was established by the Menominee Nation to promote the continued use of the language. In the 21st century, residents of the Menominee reservation at Keshena have held intensive classes for learners of all ages, and have worked with linguists from the University of Wisconsin–Madison to document the language and to develop curriculum and learning materials. A Menominee dictionary project, led by Monica Macaulay, has resulted in the publication of modern dictionaries of the language in support of revitalization efforts.

In 1977, Menominee High School, founded when "the Indians of the Menominee Reservation separated from the Shawano-Gresham School District to open their own district", began to offer Menominee language, drumming, and tribal dance in addition to its academic program.

Classes in the Menominee language are available locally at preschool, high school and adult levels, and at the College of Menominee Nation and University of Wisconsin–Green Bay.