Lucy O'Brien FBA (born 1964) is a British philosopher and the Richard Wollheim Professor of Philosophy at University College London.

[1] O'Brien predominantly works in the philosophy of mind and action, focusing in particular on self-consciousness and self-knowledge.

[citation needed] O'Brien has co-edited the philosophical journal Mind with A. W. Moore[2] since September 2015.

[citation needed] She is the first female editor of the periodical in its 140-year history.

[citation needed] She was elected chair of trustees of The Royal Institute of Philosophy in 2020 and was recipient of a Humboldt Research Award in 2022.