Alba Lucía Riquelme Valenzuela (born February 5, 1991, in Asunción, Paraguay) is a Paraguayan model and beauty pageant titleholder who was crowned Miss Universo Paraguay 2011 and represented her country in the 2011 Miss Universe pageant. She is not related to fellow Paraguayan model, Larissa Riquelme.

Alba was born on February 5, 1991 in the capital city of Paraguay. Her parents are César Riquelme and Mabel Valenzuela. Alba has 4 siblings. In 2009 she finished high school at Trinity School in Luque, Greater Asunción, then she continues her studies at Universidad Americana with major in Public Relations.

Her model career began at age 14 when she won the Elite Model Look Paraguay 2005 contest, and went to China to represent Paraguay. She was chosen as a finalist for the Miss Hawaiian Tropic 2009 in Punta del Este, Uruguay. Also in 2009, she participated at the Yanbal Fashion Week, in Ecuador, it was the second time that the CN Models International Search 2009 were held and it was won by Alba. In May 2010, she represented Paraguay at the Miss Beauty of the World 2010 held in People's Republic of China, she was among the Top 10 finalists.