The 2021 Transylvania Open was a women's tennis tournament played on indoor hard courts.

Second-seeded Anett Kontaveit won the singles title.

By winning the title, Kontaveit qualified for the WTA Finals.

[2] Anett Kontaveit defeated Simona Halep, 6–2, 6–3 Irina Bara / Ekaterine Gorgodze defeated Aleksandra Krunić / Lesley Pattinama Kerkhove, 4–6, 6–1, [11–9].

The following players received wildcards into the main draw: The following players received entry using a protected ranking: The following players received entry from the qualifying draw: The following player received entry as a lucky loser: The following pairs received wildcards into the doubles main draw: