נייגל ידוע גם בשל הגותו המוסרית ותורתו הפוליטית הדאונטולוגיות-ליברליות, העולות בספרו מ-1970 "אפשרות האלטרואיזם" ("The Possibility of Altruism") ובכתבים אחרים.
Nagel, Thomas (1970). The possibility of altruism. Princeton, N.J: Oxford University Press. ISBN9780691020020. (Reprinted in 1978, Princeton University Press.)
Nagel, Thomas (2002). Concealment and exposure: and other essays. Oxford New York: Oxford University Press. ISBN9780195152937.
Nagel, Thomas (2010). Secular philosophy and the religious temperament: essays 2002–2008. Oxford New York, N.Y: Oxford University Press. ISBN9780195394115.
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