Vicky Foxcroft has been appointed as shadow minister for civil society.
The MP for Lewisham Deptford has today replaced Steve Reed, who has been appointed shadow minister for children.
Reed, who was the shadow charities minister from October 2016, led the publication of Labour's long-awaited civil society strategy earlier this month.
Foxcroft's role covers civil society, the third sector and loneliness.
Foxcroft, who previously served as an opposition whip, worked for the trade union Unite before entering parliament at the 2015 election.
She said in a statement she was delighted to take up the role.
"I’m looking forward to holding the government to account, amplifying the voice of our civil society and working to tackle loneliness across all our communities," she said.
The position of shadow children's minister has been vacant since Emma Lewell-Buck resigned from the position in March.