Arquitectos sin Fronteras (ASF)  or Architects Without Borders in English, is a Spanish NGO that defends the right to decent housing in both developing countries and in its own society.

ASF is a Non-Governmental Development organization founded in 1992 and declared a public utility in 1999. ASF acts independently of political, economic and religious criteria and consists of people who believe in defending human rights to achieve a more just world through the universal access to decent housing to achieve social transformation. ASF works within the framework of the Millennium Development Goals, especially in relation to overcoming the causes of poverty and improving education, gender equality, health and environmental quality, regardless of race, religion, creed or political affiliation. ASF is a member of the Coalition of Development NGOs from Spain. ASF International Network coordinates ASF's work in different countries.

The mission of Architects Without Borders is to promote equitable and sustainable human development through improving the livability and protect the right of people to have decent housing. ASF's projects also support education, health, sanitation, infrastructure and housing, in rural Africa and Latin America, using local materials and technologies and low cost. All our projects promote democratic action of the beneficiary communities and gender mainstreaming. To this end, we establish links with local authorities, we have on-site workers, without intermediate construction so that the people themselves undertake the project, facilitating sustainability for the long term. We are an organization formed by a team of volunteers and technicians committed to the values ​​of cooperation, we perform our work with responsibility, professionalism and quality, also working at the local level, addressing livability issues in much of the Spanish territory and carrying out awareness campaigns and reporting.

ASF is funded through the collaboration of its more than 1200 partners such as municipalities, regional governments, the Government of Spain, companies, professional associations (of Architects, Technical Architects, Draftsmen).