Ultralight bosons provide well-motivated candidates for physics beyond the Standard Model and can be probed through both astrophysical observations and precision quantum measurements. In this talk, I will discuss how pulsar spin-down luminosity, photon polarisation from the Crab pulsar, magnetar systems, and black hole spins can constrain ultralight scalars and pseudoscalar axions, emphasising their distinct observational signatures. I will then describe complementary laboratory searches where ultralight fields oscillating as dark matter induce measurable phases or currents in Josephson-based superconducting devices to probe feeble ultralight-boson couplings.