Simone Campbell SSS (born October 22, 1945), is an American Catholic religious sister, lawyer, lobbyist and executive director of NETWORK.

She joined the Sisters of Social Service, an international Catholic religious congregation rooted in the Benedictine tradition, in 1964 and took her final vows in 1973, adopting the name "Simone.

As a part of her work with NETWORK, Campbell wrote the "nuns' letter" supporting the reforms and asked leaders of women's religious orders to sign it.

[8] Campbell and a small group of religious sisters (commonly, "nuns") make tours on a dedicated bus to highlight social issues.

In honor of her advocacy work she was the 2014 recipient of the Pacem in Terris Peace and Freedom Award, which commemorates the 1963 encyclical of Saint John XXIII of the same name.

[10][11] Campbell was among the people attentioned by then Pope Benedict XVI in his investigation of American nuns for communist views[12] and promoting "certain radical feminist themes incompatible with the Catholic faith".

The official report from the investigation was quoted as including "oversight of their publications and choice of speakers for their annual conference to ensure doctrinal orthodoxy, and both sides agreed to a new set of statutes for the LCWR.