Horizon 2020 è il principale programma dell'Unione Europea per il finanziamento della ricerca e dell'innovazione, con una dotazione di quasi 80 miliardi di euro per un periodo di sette anni (2014-2020). Le call sono disponibili sul Participant Portal dell'UE. 
Horizon 2020 è composto secondo varie azioni, cliccando sulle singole voci è possibile accedere alla descrizione:

Excellent Science

• European Research Council
• Future and Emerging Technologies
• Marie Skłodowska-Curie actions
• European Research Infrastructures, including e-Infrastructures

Industrial Leadership

• Leadership in Enabling and Industrial Technologies
• Information and Communication Technologies
• Nanotechnologies, Advanced Materials, Advanced Manufacturing and Processing, and Biotechnology
• Space
• Access to risk finance
• Innovation in SMEs

Societal Challenges

• Health, Demographic Change and Wellbeing
• Food Security, Sustainable Agriculture and Forestry, Marine, Maritime and Inland Water Research and the Bioeconomy
• Secure, Clean and Efficient Energy
• Smart, Green and Integrated Transport
• Climate Action, Environment, Resource Efficiency and Raw Materials
• Europe in a changing world - Inclusive, innovative and reflective societies
• Secure societies – Protecting freedom and security of Europe and its citizens

Azioni trasversali

• European Institute of Innovation and Technology (EIT)
• Spreading Excellence and Widening Participation
• Science with and for Society