Born in 1978 in Rakovník, Czech Republic, Dagmar Šašková began her music and singing studies at the University of West Bohemia in Pilsen with Ludmila Kotnauerová. In 2002, she won second prize at the Leoš Janáček International Competition in Brno and a special prize from Bohuslav Martinů. She continued at the Janáček Academy of Musical Arts in Brno. In 2008, she brilliantly obtained her diploma in baroque singing at the Centre de musique baroque de Versailles.

Dagmar Šašková often performs in concerts with ensembles such as Versailles Baroque Music Centre, Akadêmia, Correspondances, El Sol, Il Festino, La Fenice, La Rêveuse, Harmonia Sacra, Le Poème Harmonique, or Musica Florea.

She has taken part in the recordings of Marc Antoine Charpentier’s Sacred Stories and Pierre Robert’s Grands Motets conducted by Olivier Schneebeli, as well as in the extracts from Opella Nova and Israelis Brünnlein by Johann Hermann Schein with the Sagittarius orchestra conducted by Michel Laplénie. She has also recorded Dietrich Buxtehude’s Cantatas for soprano with Le Concert brisé conducted by William Dongois, the Italian Aria from the Time of Louis 13th of France and Arie da cantarsi of Stefano Landi with the ensemble Il Festino (Manuel de Grange), and finally Johann Sebastian Bach’s B-Minor Mass with the Pygmalion orchestra conducted by Raphaël Pichon. She also recorded The Royal Night Concert with the ensemble Les Correspondances (Sébastien Daucè) , Natale in Italia with La Fenice (Jean Tubéry) and Majesté (Grand motets by Delalande) with Le Poème harmonique (Vincent Dumestre). For the moment, the two last contributions to her discography are Donna – Monteverdi Madrigali e motetti a due voci femminili with the ensemble Il Festino and Reinas with the ensemble El Sol (Chloé Sévère).

In 2010, she made her debut as Corisande in Jean-Baptiste Lully's opera Amadis, a co-production of the Centre de musique baroque de Versailles and the Théâtre d'Avignon (conducted by Olivier Schneebeli, directed by Olivier Bénézech) in Avignon and Massy. In 2011, she appeared as Moschino, Ninfa, Rubanière and Fleure in the opera L'Egisto by Marco Marazzoli and Virgilio Mazzocchi (Les Palladins, conducted by Jérôme Correas, directed by Jean-Denis Monory) in Massy, at the Théâtre l'Athénée in Paris and in Cergy-Pontoise. In 2011, she played the role of Apollo in George Friedrich Händel's opera Terpsicore with Musica Florea (Marek Štryncl and Helena Kazárová) in Český Krumlov and in 2017, at the Handel Festival in Halle and in 2013 Melanto in Claudio Monteverdi's Le Retour d'Ulysse (Les Palladins, (conductor Jérôme Correas, director Christophe Rauck) in Massy, at the Théâtre Gérard-Philipe Saint-Denis, in Reims, Nice and Saint-Quentin en Yvelines.

With the Akadêmia ensemble (Françoise Lasserre and François Rancillac), she travelled to New Delhi in India to perform the role of Ninfa in Claudio Monteverdi's L'Orfeo par-delà le Gange (also at the Cité de la Musique in Paris). In 2014, Dagmar Šašková played the title role in Henry Purcell's Dido and Aeneas in concert in Lyon and Uzès with the La Fenice ensemble (Jean Tubéry). In 2016, she toured with Marc Antoine Charpentier's Les Histores sacrées as Judith in South Korea with the Centre de musique baroque de Versailles (conductor Olivier Schneebeli, director Ana Yepes). In the French tour of L'Orfeo par-delà le Gange in 2016, she was La Musica and La Messagiera on stage at the Arsenal de Metz and the Opéra de Reims.

In 2018, with La Simphonie du Marais (Hugo Reyne), Dagmar Šašková performed Venus, Olympia and Zaïde in André Campra's L'Europe Galante at the Wienerkonzerthaus in Vienna. In 2019, she appeared as Aurora in Galuppi's opera Le monde à l'envers at the Opéra Grand Avignon and the Philharmonie de Paris (conducted by Françoise Lasserre, directed by Vincent Tavernier). In July 2021, she played the role of Lucie in Antoine Reicha's opera Gusman in the Czech Republic (world premiere).