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Johanna Maria Louise Loisinger (18 April 1865 – 20 July 1951) was an Austrian actress, pianist and operatic soprano singer. She was born in Preßburg, Austria (today Bratislava), the daughter of John Loisinger and Maria Meier.
Loisinger married Prince Alexander of Battenberg (1857–1893) on 6 February 1889 in Menton, Alpes-Maritimes, France. The prince had resigned from the Bulgarian throne in 1886 and had assumed the style of Count von Hartenau, so Loisinger became the Countess von Hartenau. The couple settled in Graz, Austria, and had two children, Assen Ludwig Alexander (1890–1965) and Marie Therese Vera Zvetana (1893–1935). After her husband's early death, she moved to Vienna, where she was an active patron of musical organisations. Among other posts, she was president of the Vienna Symphony.
Loisinger died on 20 July 1951 in Vienna. She was buried in St. Leonhard Cemetery in Graz where her daughter Zvetana was previously buried.