The NRAO and the ngVLA project will convene a Splinter Session titled "The Highest Angular Resolution Frontier" on 7 January 2026 at the 247th meeting of the American Astronomical Society, in Phoenix, Arizona, USA. This session will highlight recent science breakthroughs enabled with milli- and micro-arcsecond angular resolutions. It will also discuss future science possibilities that demand joint improvements in angular resolution and sensitivity. Invited oral presentations will cover neutrino-emitting blazars, compact binary ejecta, young planets in protoplanetary disks, astronomy with the celestial reference frame, and enabling instrumentation. To broaden information sharing, the presentations will eventually be posted and advertised world wide. [Image credit: Science Communication Labs]