The invention relates to nitrooxyderivative of corticosteroids of general formula (I) and pharmaceutically acceptable salts or stereoisomers thereof R—(Z)a—Rx  (I) wherein R is the corticosteroid residue of formula (II): wherein: R1 is OH, R2—CH3, or R1 and R2 are taken together to form a group of formula (III) R3 is Cl or F; R4 is H or F; wherein R1, R2, R3 and R4 can be linked to the correspondent carbon atoms of the steroidal structure in position α or β; with the proviso that: when R1 and R2 are the group of formula (III) then R3 is F and R4 is H or F; The compounds are useful in the treatment of respiratory diseases, inflammatory diseases, dermatological diseases and ocular diseases.