Classic Mussar Works
The golden era of Mussar literature lasted for almost a thousand years, beginning with the 900s and stretching on to the start of the historical Mussar movement in the 1800s. These are some of the classic works (מוסר קלאסי) from that time. Be sure to also see the Top Ten list for the best books from this era. This whole collection of 100+ Mussar books is also available as a PDF here.
Beliefs & Opinions (האמונות והדעות)
Book of Beliefs and Opinions or Sefer Emunot v'Deot (ספר האמונות והדעות) was written by the great Saadia Gaon (סעדיה גאון) in the early 900s as a philosophical defense of the core beliefs of Judaism. Its tenth and final chapter on Moral Conduct in particular was the first glimmering of the classical Mussar era. Originally written in Judeo-Arabic, it wasn't until a couple centuries later that it was translated into Hebrew and a thousand years later that it was translated into English.
Get the Samuel Rosenblatt translation, published by Yale, which by 1989 was already in its fifth printing. 498 pages.
There's also this reprint of the original Alexander Altmann translation. 200 pages.
Fixing Soul Traits (תיקון מידות הנפש)
'Fixing Soul Traits' or more commonly 'The Improvement of the Moral Qualities' is a translation of Tikkun Middot Hanefesh (תיקון מידות הנפש). This little book was written by Solomon ibn Gabirol (שלמה אבן גבירול) in Arabic in the early 1000s and was translated into Hebrew over a century later. It was one of the three books that Rabbi Israel Salanter had reprinted for the Mussar movement. Get this reprint of the original 1902 translation by Stephen Wise. 191 pages.
Choice Pearls (מבחר הפנינים)
Choice Pearls or Mivchar Peninim (מבחר הפנינים) is a collection of Mussar Proverbs written by the poet Solomon ibn Gabirol (שלמה אבן גבירול) in the early 1000s. Get this reprint of the original 1859 translation by B. H. Ascher. 216 pages.
Book of the Righteous
Book of the Righteous or Sefer HaYashar (ספר הישר) was written in the mid-1100s by an anonymous author, possibly Rabbeinu Tam (רבנו תם). Not to be confused with the quasi-biblical book of Jasher which has the same Hebrew name. Get the 1973 English translation by Seymour Cohen. 298 pages.
Book of the Pious (ספר חסידים)
Guide to Serving God (המספיק לעובדי השם)
Guide to Serving God or HaMaspik l'Ovdei Hashem (המספיק לעובדי השם) was written by Rabbeinu Avraham (אברהם בן הרמב"ם) the son of the Rambam himself around 1230. Get Feldheim's Hebrew/English 2007 fullsize edition or the 2013 compact edition. 614 pages.
Ramban's Ethical Will (אגרת הרמב״ן)
The Iggeret HaRamban (אגרת הרמב״ן) was a Mussar letter written by Moses Ben Nachman (רבי משה בן נחמן) commonly known as the Ramban/Nachmanides (רמב״ן) to his son shortly before his death in 1270.
Get Artscroll's 1989 publication of the Iggeres HaRamban in Hebrew/English with commentary. 144 pages.
There are also two 2007 'Bentscher' versions with the Grace After Meals prayers, one with a paperback cover and the other leatherette.
Staircase of Virtues (מעלות המדות)
Maalot HaMiddot (מעלות המדות) literally means Staircase of Virtues. Written by Yechiel Ben Yekutiel (רבי יחיאל בר יקותיאל) in the late 1200s, it lists 24 qualities/middot and their opposites. Get Moznaim's 1994 translation by Shraga Silverstein, The Book of Middoth. 355 pages.
Paths of Life (ארחות חיים)
Paths of Life or Orchot Chaim (ארחות חיים) was written in the early 1300s by Rabbeinu Asher Ben Yechiel (רבי אשר בן יחיאל), better known as The Rosh (רא״ש), to his sons. Get Artscroll's fullsize 1993 publication or the 2016 pocketsize version. 248 pages.
Why Catastrophes Come (אגרת מוסר)
Solomon Alami (שלמה אלעמי) wrote his Epistle of Rebuke or Iggeret Mussar (אגרת מוסר) to one of his disciples in 1415 as anti-Jewish persecution was sweeping Spain, attempting to explain Why Catastrophes Come. Download part of the letter translated into English.
Rivkah's Nurse (מינקת רבקה)
Rebecca's Nurse or Meneket Rivkah (מינקת רבקה) was written by Rivka Bat Meir Tiktiner (רבקה בת מאיר טיקטינר) in the mid-1500s. Not only was it the first Yiddish book to be written by a woman, it was also one of the only Mussar books written by a woman before the modern era. Get the Yiddish/English Meneket Rivkah translated by Frauke Von Rohden and published by the Jewish Publication Society in 2009. 360 pages.
Gates of Holiness (שערי קדושה)
Gates of Holiness or Sha'arei Kedusha (שערי קדושה) is a kabbalistic Mussar work written by Rabbi Chaim Vital (חיים ויטאל) around 1575. As you can see, it's rare on Amazon so read the 2013 English translation by Rabbi Amiram Markel on Sefaria so search the ISBN or find a library copy through Worldcat. 208 pages.
Beginning of Wisdom (ראשית חכמה)
Deborah's Palm Tree (תומר דבורה)
The Palm Tree of Devorah or Tomer Devorah (תומר דבורה) was a small kabbalistic work written by Rabbi Moses Cordovero (משה קורדובירו) around 1570 and could be included in the Top Ten for its popularity. Get this beautiful pocketsize version with imitation leather cover, divided into 30 daily readings. Translated by Rabbis Dov Fink and Shimon Finkelman. 80 pages.
There's also Targum's 1994 Hebrew/English translation by Moshe Miller. 232 pages.
For more commentary see Feldheim's 2015 Elucidated Tomer Devorah, translated by Rabbi Shmuel Meir Riachi. 288 pages.
Two Tables of the Covenant (שני לוחות הברית)
Two Tables of the Covenant or Shney Luchot Habrit (שני לוחות הברית) was written around 1630 by Rabbi Isaiah Horowitz (ישעיה הלוי הורוביץ), popularly known as the Holy Shelah (השל״ה הקדוש). The three-volume set with 1327 pages is very rare as you can see on Amazon but that same translation by Eliyahu Munk can be read on Sefaria. The WorldCat listings are confusing as to which volumes are carried and where.
The Just Measure (קב הישר)
A Little Note (צעטיל הקטן)
The Tzetel Katan (צעטיל הקטן) or Little Note is a Hasidic Mussar book written in 1750 by Rabbi Elimelech Weisblum of Lizhensk (רבי אלימלך ויסבלום). Get this beautiful edition translated by Rabbi Eliezer Shore and published by Israel Bookshop Publications in 2016. 302 pages.
Testament of Rabbi Israel (צוואת הריב״ש)
The Testament of Rabbi Israel or Tzava'at HaRivash (צוואת הריב״ש) is a collection of teachings from the founder of the Chasidic movement, usually called the Baal Shem Tov (בעל שם טוב) or simply the Besht (בעש״ט). Get this Chassidic Mussar book, translated by Rabbi Jacob Immanuel Schochet and published by Kehot in 1998, in hardcover or ebook. 186 pages.
Aleph-Bet Book (ספר האלף-בית)
The Aleph-Bet Book (ספר האלף-בית) is a collection of proverb-like sayings from Rebbi Nachman of Breslov (רבי נחמן מברסלב), an early Hassidic Rabbi. Get the 268-page 1986 edition or the updated and expanded 573-page 2015 edition, translated by Moshe Mykoff and published by the Breslov Research Institute.
Wonderful Counsellor (פלא יועץ)
Wonderful Counsellor or Pele Yoetz (פלא יועץ) was written by Rabbi Eliezer Papo (רבי אליעזר פאפו) in 1824. Get the full two-volume set translated by Rabbi Shmuel Kurtz and published by Noam Eliezer in 2021. 875 pages.
There's also the smaller Essential Pele Yoetz: An Encyclopedia of Ethical Jewish Living translated by Marc Angel and published by Intellectbooks in 2008. 272 pages.