The Large Synoptic Survey Telescope (LSST) is one of the most ambitious science projects of the next decade. It will survey the entire visible sky every few days, producing a stacked sky survey of unprecedented depth and area. The co-added data within the 18,000 square degree survey footprint will be 5 mag deeper than the SDSS (r ~ 27.5), with the main survey producing a database of around 20 billion galaxies and a similar number of stars. With the UK community now bought into LSST, we describe areas where the UK will be able to offer leadership and contribute significantly to LSST science e.g. theoretical modelling, low surface-brightness science, combination of LSST data with current and future ‘UK/European’ datasets (SKA precursors, NIR surveys using VISTA, Euclid etc.) and citizen science via Galaxy Zoo. A kick-off collaboration meeting between US and UK astronomers, which is likely to be significant in shaping the UK's role in the LSST Galaxies effort will take place in July of this year: https://lsstgalaxies2016.wordpress.com/