Alca may refer to:
- Advanced Light Combat Aircraft; see Aero L-159 Alca
- Alca, a genus of birds
- Apostolic Lutheran Church of America
- The Free Trade Area of the Americas, known as Área de Libre Comercio de las Américas in Spanish, and Área de Livre Comércio das Américas in Portuguese
- The Professional Landcare Network, previously known as the Associated Landscape Contractors of America
This disambiguation page lists articles associated with the title Alca.
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