Pirkei Avot (Hebrew: פרקי אבות) (also rendered as Pirkei Avoth or Pirkei Avos or Pirke Aboth), which translates to English as Chapters of the Fathers, is a compilation of the ethical teachings and maxims passed down to the Rabbis, beginning with Moses and onwards. It is part of didactic Jewish ethical Musar literature. Because of its contents, it is also called Ethics of the Fathers. Pirkei Avot consists of the Mishnaic tractate of Avot, the second-to-last tractate in the order of Nezikin in the Mishnah, plus one additional chapter. Pirkei Avot is unique in that it is the only tractate of the Mishnah dealing solely with ethical and moral principles; there is little or no halacha (laws) found in Pirkei Avot.
In the Mishnaic sense, the word avot, meaning "fathers," refers to fundamentals, or principal categories. Thus, the principal categories of creative work forbidden on Shabbat are called avot melacha, and the principal categories of ritual impurity are referred to as avot tum'ah. Perakim, or in the construct form pirkei, means "chapters." Thus Pirkei Avot means "Chapters of Fundamental Principles".
The recognition of ethical maxims as 'Fundamental Principles' may derive from the high regard in which the Torah, Mishnah, and Talmud hold such wisdom. "Love your neighbor as yourself," states the Bible (), an injunction that Rabbi Akiva in Genesis Rabbah 24:7 famously calls a "great principle" of the Torah. In Shabbat 31a, Hillel says "That which is hateful to you, do not do to your fellow: This is the entire Torah, the rest is the explanation, go now and learn it." (This maxim is not included in Pirkei Avot.) The attribution of Biblical Wisdom books to King Solomon (e.g., Ecclesiastes, Proverbs, Book of Wisdom) attests also to the central importance that Jews of this period placed on transmitting the ethical way of life.