See main article: article and 2021 Reinert Open.
Amina Anshba and Anastasia Dețiuc were the defending champions[1] but chose not to participate.
Anna Danilina and Valeriya Strakhova won the title, defeating Mirjam Björklund and Jaimee Fourlis in the final, 4–6, 7–5, [10–4].