Gillian Anderson is married at the time of the filming of the X-Files series with artistic director Clyde Klotz, with whom she has a daughter Piper Maru, born on September 25, 1994. She gets pregnant at the end of the first season , But it is not replaced, its appearances are reduced during the first episodes of season 2 and it is filmed in close- ups . She stops filming two days before giving birth and undergoes a Caesarean section . Divorced in 1997, she raises her daughter Piper to Vancouver in Canada and then in Los Angeles until the end of the series.

She remarries with a journalist and then, after a second divorce, connects with the businessman Mark Griffiths, of which she has two sons, Oscar in 2006, and Felix in 2008 13 .

In an interview in 2012 , the actress evokes "a long relationship with a girl" during her high school education; it also states that the relationships she has had in his youth with the girlfriend and other women in his life represented an "exception" and not the standard 14 . She has since expressed her annoyance at the insistence of some journalists on this episode of her life, noting that she never considered herself homosexual and that she had only mentioned it in 2012, only to pay tribute to his ex-girlfriend, who died a short time before 15 .