Strongly lensed supernovae (SNe) are emerging as a new probe of cosmology and SN. The time delays between the multiple images of a lensed SN can be used to determine the Hubble constant (H0) that sets the expansion rate of the Universe. An independent determination of H0 is important to ascertain the possible need of new physics beyond the standard cosmological model, given the tension in current H0 measurements. While strongly lensed SNe are rare, the first lensed SN systems are being discovered in the past few years. I will give an overview of these first discoveries and their cosmological results. Future surveys, particularly the Rubin Observatory Legacy Survey of Space and Time, are expected to yield hundreds of such exciting events. I will highlight a new program aimed to find and study lensed SNe for cosmology and stellar physics.