The Physics Division at Lawrence Berkeley National Laboratory (Berkeley Lab) announces the competition for the 2026 Owen Chamberlain Fellowships in Experimental Particle Physics and Cosmology. The Fellowship is named after Berkeley Nobel Laureate Owen Chamberlain, who, together with Emilio Segrè, Clyde Wiegand, and Thomas Ypsilantis, discovered the anti-proton at the Berkeley Bevatron in 1955. The Physics Division’s experimental portfolio encompasses high-energy collider physics, neutrino physics, direct detection of dark matter, rare and precision physics, and experimental cosmology (instrumentation, simulation and data analysis). In addition, the Division’s program has world-leading efforts in advanced instrumentation (detector development and microelectronics), quantum information science (sensing and simulations), and artificial intelligence/machine learning. Research areas highlighted for 2026 include ATLAS, rare event searches with quantum sensors, DUNE applications of AI/ML, and future collider detector development. AI/ML (including Hardware AI), quantum sensing, and microelectronics are critical technologies of interest. Chamberlain Fellows are appointed for 3 years, with the possibility of a 2-year renewal based upon satisfactory job performance and continuing availability of funds. Appointments may start during the 2026 calendar year. Appointees will receive an annual research supplement of $10,000 in addition to the support from the research group.