Alternative Social-Liberal Party (Bulgarian: Алтернативна социаллиберална партия), was founded on February 11, 1990, as the Alternative Socialist Party (Алтернативна социалистическа партия).
The party was registered on March 7, 1990, with first president Nikolay Vasilev.
The party participated independently in the 1990 parliamentary elections, and got 0.36% of the votes.
In the October 1991 parliamentary elections, the party won six seats on the lists of UDF.
The remainder of ASP is now led by Alexander Dimitrov and Raicho Radev.