An alliance can be:

• an agreement between two parties, made in order to advance common goals and to secure common interests. See also:
  • a military alliance formed between states
  • a business alliance formed between organisations
  • alliances in the Bible
• Alliance is a name of several political parties:
• a New Zealand political party, the Alliance
• a Canadian political party, the Canadian Alliance
• a Northern_Ireland political party, Alliance
• the former name of the Malaysian political coalition currently known as the Barisan Nasional (National Front).
• Alliance is also the name of a number of places
  • in the United States of America:
    • Alliance, Nebraska
    • Alliance, Ohio
    • Alliance, North Carolina
  • and in Canada:
    • Alliance, Alberta
    • Alliance, Ontario
    • Belle-Alliance Electoral District, Quebec
• a group in the Star Fleet Universe, the General War-era Alliance
• a common name for (ostensibly) democratic, "good-guy" (often, but not always) star-nations in various science fiction universes - Babylon 5's Earth Alliance, Star Wars's Rebel Alliance, Firefly's Anglo-Sino Alliance, et cetera.