Greta Christina (born 1961) is an American atheist, blogger, speaker, and author.

[3] In 2016 she co-founded The Orbit, which she described as "the first atheist media site founded explicitly to work on all forms of social justice".

She said that there are many goals for the atheist movement – more separation of church and state, ending "bigotry against atheism", and for some, persuading people "out of religion", and that it is a "valid goal" to work towards a world without religion.

[7] She was a speaker on the Diversity in Skepticism panel at The Amaz!ng Meeting in July 2011, the Reason Rally in 2012,[12] and the 50th annual convention of American Atheists in 2013.

[15] In 2013 Christina was named the International Team Honored Hero of the Foundation Beyond Belief (FBB).

[22][23] Christina is an Advisory Board member of the SSA and a donor at the Lifetime Membership level.

[27][28][29] In San Francisco, Christina has worked at the underground book publisher Last Gasp and the Lusty Lady peep show,[6][30] and has performed in pornography.