All massive galaxies are thought to contain supermassive black holes but the connection between black hole accretion, star formation, galaxy evolution and black hole growth remains debated. Mechanisms of quenching or triggering of black hole activity and the impact or role of the host environment are currently open questions.

The LSST will revolutionise our understanding of Active Galactic Nuclei and the evolution of their host galaxy environments through cosmic epoch and ultimately in real-time; this talk will briefly summarise the opportunities for AGN science with LSST and highlight some of the observational and theoretical areas in which the UK leads