She said: “I am very proud of what I was able to achieve in my previous role there, not least introducing equal marriage, ending the fingerprinting of children and banning wheel clamping on private land.
“I am also looking forward to continuing my work tackling violence against women and girls and on ending female genital mutilation at home and abroad.
“I have always had a very constructive relationship with Theresa May and I look forward to working with her again.”
Lib Dem leader Nick Clegg said: “Lynne Featherstone has been an exceptional minister over the last four and a half years and returns to the Home Office, where her tough but liberal approach will be invaluable.”