Esther María Koplowitz y Romero de Juseu, 7th Marchioness of Casa Peñalver is a Spanish businesswoman and philanthropist.

Koplowitz is vice-president of the Board of Fomento de Construcciones y Contratas (FCC), one of the leading diversified Spanish groups, employing around ninety thousand people.

WikiLeaks reveals that Esther Koplowitz made donations to the conservative organisation Hazte Oír, which itself funds the Vox party.

On July 13, 2001, the Council of Ministers of Spain awarded Esther Koplowitz the Grand Cross of the Order of Civil Merit for her longstanding support of social causes.

[12] In December 2007, she received the "Goxua" Bilbotarra Award from the 21st Century Association of Women Entrepreneurs and Professionals of Bilbao.

[16] On October 8, 2008, she received the Gold and Diamond Insignia from the Orphan Foundation of the National Police Corps (Spain) awarded by its President, Ignacio Conde.

[24] In June 2012, she was decorated with the Cross of the Order of Knight of the Legion of Honour by the Republic of France for her business achievements and philanthropy.

[37] In November 2014, she received the Gold Medal of Merit in Work,[38] and was appointed as a Dame of the Noble Corps of the Principality of Asturias.