La Lodoiska is an opera in three acts by Simon Mayr to an Italian libretto by Francesco Gonella De Ferrari.
On 4 November 1798 it had its first performance at the Teatro Real de São Carlos in Lisbon in celebration of the name day of Carlota Joaquina of Spain.
It was Mayr's first opera to be performed there and its success led to more commissions from La Scala and other Milanese theatres.
Princess Lodoiska has been entrusted by her father to the care of Boleslao, lord of the Castle of Ostropoll.
Lovinski arrives (under the name "Siveno") to ask for Princess Lodoïska on behalf of her father, but Boleslao refuses to let her go.