Seder (; plural: sedarim) is a Hebrew word meaning "order" or "sequence" may also refer to:
Jewish holidays Passover Seder, a ritualized dinner observed during Passover Tu BiShvat, a seder for this minor Jewish holiday modeled on the Passover Seder
Hebrew Bible A portion of a biblical book in the Masoretic Text of the Tanakh; this quantitative division is related to the triennial cycle for reading the Torah A colloquial term for the weekly Torah portion in the annual cycle of reading the Torah (in this context often pronounced sidra)
Talmudic texts One of the six orders (major sections) of the Mishnah A study session in a Yeshiva's daily schedule; see .
Jewish liturgy An order of prayers that constitutes a liturgy
Jewish mysticism Seder hishtalshelus, a concept in kabbalah about the nature of God
People with the surname Đuro Seder (born 1927), Croatian painter Sam Seder (born 1966), American actor Tim Seder (born 1974), American football player