Gillian Anderson has shared that she is pansexual, indicating attraction to all genders. The X-Files star has previously discussed her sexual fluidity, including relationships with women, in interviews as far back as 2012 with Out magazine. Anderson's identification as pansexual was mentioned in a profile where she discussed her past relationships and attraction to all genders.

This label is not entirely new for Anderson, who had touched on the concept in a 2024 conversation about her book. Further details about Anderson's thoughts on her identity are available from the source, including an interview with The Australian.