Maggie Gyllenhaal has been named as the first female brand ambassador for Eton, announced in October 2025. In the campaign, she wears four exclusively created shirts designed through Eton's Custom Made program.

Maggie Gyllenhaal was appointed as a member of Miu Miu's Women's Tales Committee in September 2023, contributing to the brand's short film series that focuses on supporting female filmmakers. She has expressed her admiration for Miu Miu's dedication to honest depictions of women, highlighting their commitment to showcasing diverse stories and perspectives.

Maggie Gyllenhaal signed with Superprime Films for representation in branded and commercial work across the US, UK, and France as of September 2025.

Maggie Gyllenhaal participated in a women's leadership panel hosted by Neiman Marcus in March 2022, discussing the significance of women in leadership positions. The event featured over 100 women from various fields, highlighting their contributions and experiences.

Maggie Gyllenhaal was honored by Loacker as an inspirational example of a 2019 PowerMom during their third annual PowerMom celebration. This event included a Facebook Live session where Maggie participated in an intimate discussion and Q&A about motherhood, empowering working mothers nationwide.