The 12th generation of the International Geomagnetic Reference Field (IGRF) was adopted in December 2014 by the Working Group V-MOD of the International Association of Geomagnetism and Aeronomy (IAGA). This generation updates the previous IGRF with a definitive main field model for epoch 2010.0, a main field model for epoch 2015.0, and a linear annual predictive secular variation model for 2015.0-2020.0. The paper presents the equations defining the IGRF model, provides the spherical harmonic coefficients, and maps of the magnetic declination, inclination, and total intensity for epoch 2015.0, along with their predicted rates of change for 2015.0-2020.0. It also updates the magnetic pole positions and discusses the latest changes and possible future trends of the Earth's magnetic field. The IGRF-12 model is derived from candidate models prepared by international teams, reflecting the collaborative efforts of scientists, institutions, and space agencies. The final IGRF-12 models were calculated using a new weighting scheme for the candidate models, ensuring a robust and comprehensive representation of the geomagnetic field.The 12th generation of the International Geomagnetic Reference Field (IGRF) was adopted in December 2014 by the Working Group V-MOD of the International Association of Geomagnetism and Aeronomy (IAGA). This generation updates the previous IGRF with a definitive main field model for epoch 2010.0, a main field model for epoch 2015.0, and a linear annual predictive secular variation model for 2015.0-2020.0. The paper presents the equations defining the IGRF model, provides the spherical harmonic coefficients, and maps of the magnetic declination, inclination, and total intensity for epoch 2015.0, along with their predicted rates of change for 2015.0-2020.0. It also updates the magnetic pole positions and discusses the latest changes and possible future trends of the Earth's magnetic field. The IGRF-12 model is derived from candidate models prepared by international teams, reflecting the collaborative efforts of scientists, institutions, and space agencies. The final IGRF-12 models were calculated using a new weighting scheme for the candidate models, ensuring a robust and comprehensive representation of the geomagnetic field.