Psalm 133 is the 133rd psalm from the Book of Psalms. It is one of 15 psalms that begins with the words "A song of ascents" (Hebrew: שִׁיר המַעֲלוֹת Shir Hama'aloth).
The Latin title of the Psalm is Ecce Quam Bonum. The first lines, Ecce quam bonum et quam jucundum habitare fratres in unum ("Behold how good and how pleasant it is for brethren to dwell together in unity") constitute the motto of Sewanee: The University of the South and Immaculate Heart of Mary Seminary (Winona, Minnesota).