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Porträtfoto Sissy Weilharter

Mag. Sissy Kitzmüller, B.A.

Attorney-at-Law, registered mediator


Sissy Kitzmüller completed her law degree at the University of Vienna and further deepened her knowledge of business administration as part of a bachelor’s degree program. Following several internships in Brussels and London, she worked at the Institute for Labor and Social Law at the University of Vienna and most recently for several years in the legal department of a renowned telecommunications company. After completing her court clerkship at the Higher Regional Court of Vienna, she started working as an associate at Haslinger / Nagele in June 2020. Sissy Kitzmüller was admitted to the bar in January 2025. Her practice focuses on antitrust and public procurement law.

Sissy Kitzmüller is also a lecturer in the health sector.

Sissy Kitzmüller is also a registered mediator and works in the specialist areas of business (inter-company and intra-company mediation, employment, shareholder conflicts, corporate succession) and general civil matters (relationships, intergenerational conflicts, divorce/separation, property succession/estate, neighborhood, tenancy matters/condominium).

Kitzmüller/Stempkowski, Kapitel „Sektorenvergabe“ in Heid/Reisner (Hrsg), Handbuch Vergaberecht 5. Auflage (2025), wird in Kürze veröffentlicht

Holzinger K./Weilharter, Zentrale Ausscheidensgründe – Schwerpunkt Absprachen und Beeinflussung in Hofbauer/Heid/Beham (Hrsg), Handbuch Vergabe-Compliance (2024), Verlag Österreich

Holzinger K./Weilharter, Vergaberecht in Klamert (Hrsg), Jahrbuch Europarecht 2023, NWV Verlag.

Oder/Weilharter, Vergaberecht in Ruhmannseder/Wess, Handbuch Corporate Compliance (2022) Manz Verlag.

Holzinger K./Weilharter, Vergaberecht in Klamert (Hrsg), Jahrbuch Europarecht 2022, NWV Verlag.

Holzinger K./Weilharter, Vergaberecht in Klamert (Hrsg), Jahrbuch Europarecht 2021, NWV Verlag.

Neuhauser/Weilharter, Darf man fremde Inhalte auf einer Website bringen?, Der Standard vom 16.09.2020.

  • Referenz | Haslinger / Nagele, Logo: JUVE Awards
  • JUVE Top 20 Wirtschaftskanzlei-Oesterreich
  • Chambers Europe Top Ranked 2025 Logo
  • Legal500 EMEA Ranking Logo 2025
  • Promoting the best. Women in Law Award