The present invention relates to antisense oligonucleotides that modulate the expression of and/or function of a Sirtuin (SIRT), in particular, by targeting natural antisense polynucleotides of a Sirtuin (SIRT). The invention also relates to the identification of these antisense oligonucleotides and their use in treating diseases and disorders associated with the expression of Sirtuins (SIRT)s.