This disclosure relates to oligonucleotides, compositions and methods useful for reducing GYS2 expression, particularly in hepatocytes. Disclosed oligonucleotides for the reduction of GYS2 expression may be double-stranded or single-stranded, and may be modified for improved characteristics such as stronger resistance to nucleases and lower immunogenicity. Disclosed oligonucleotides for the reduction of GYS2 expression may also include targeting ligands to target a particular cell or organ, such as the hepatocytes of the liver, and may be used to treat glycogen storage diseases (e.g., GSDIa, GSDIII, GSDIV, GSDVI, and GSDIX) and related conditions.