Ki Tisa, Ki Tissa, Ki Thissa, or Ki Sisa (כִּי תִשָּׂא‎—Hebrew for "when you take," the sixth and seventh words, and first distinctive words in the parashah) is the 21st weekly Torah portion (parashah) in the annual Jewish cycle of Torah reading and the ninth in the Book of Exodus. The parashah tells of building the Tabernacle, the incident of the Golden Calf, the request of Moses for God to reveal God's Attributes, and how Moses became radiant.

The parashah constitutes Exodus 30:11–34:35. The parashah is the longest of the weekly Torah portions in the book of Exodus (although not the longest in the Torah, which is Naso), and is made up of 7,424 Hebrew letters, 2,002 Hebrew words, 139 verses, and 245 lines in a Torah scroll (Sefer Torah).

Jews read it on the 21st Sabbath after Simchat Torah, in the Hebrew month of Adar, corresponding to February or March in the secular calendar. Jews also read the first part of the parashah, Exodus 30:11–16, regarding the half-shekel head tax, as the maftir Torah reading on the special Sabbath Shabbat Shekalim. Jews also read parts of the parashah addressing the intercession of Moses and God's mercy, Exodus 32:11–14 and 34:1–10, as the Torah readings on the fast days of the Tenth of Tevet, the Fast of Esther, the Seventeenth of Tammuz, and the Fast of Gedaliah, and for the afternoon (Mincha) prayer service on Tisha B'Av. Jews read another part of the parashah, Exodus 34:1–26, which addresses the Three Pilgrim Festivals (Shalosh Regalim), as the initial Torah reading on the third intermediate day (Chol HaMoed) of Passover. And Jews read a larger selection from the same part of the parashah, Exodus 33:12–34:26, as the initial Torah reading on a Sabbath that falls on one of the intermediate days of Passover or Sukkot.

In traditional Sabbath Torah reading, the parashah is divided into seven readings (עליות, aliyot). In the Masoretic Text of the Tanakh (Hebrew Bible), Parashat Ki Tisa has ten "open portion" (פתוחה, petuchah) divisions (roughly equivalent to paragraphs, often abbreviated with the Hebrew letter פ‎ (peh)). Parashat Ki Tisa has several further subdivisions, called "closed portion" (סתומה, setumah) divisions (abbreviated with the Hebrew letter ס‎ (samekh)) within the open portion divisions. The first three open portion divisions divide the long first reading (aliyah), and the next three open portion divisions divide the long second reading. The seventh open portion corresponds to the short third reading, and the eighth open portion corresponds to the short fourth reading. The ninth open portion spans the fifth and sixth readings. And the tenth open portion begins in the seventh reading. Closed portion divisions further divide the first and second readings, and conclude the seventh reading.

In the long first reading, God instructed Moses that when he took a census of the Israelites, each person 20 years old or older, regardless of wealth, should give a half-shekel offering. God told Moses to assign the proceeds to the service of the Tent of Meeting. The first open portion ends here.

In the continuation of the reading, God told Moses to place a copper laver (כִּיּוֹר, kiyor) between the Tent of Meeting and the altar (מִּזְבֵּחַ, mizbeiach), so that Aaron and the priests could wash their hands and feet in water when they entered the Tent of Meeting or approached the altar to burn a sacrifice, so that they would not die. The second open portion ends here.

In the continuation of the reading, God directed Moses to make a sacred anointing oil from choice spices—myrrh, cinnamon, cassia—and olive oil. God told Moses to use it to anoint the Tent of Meeting, the furnishings of the Tabernacle, and the priests. God told Moses to warn the Israelites not to copy the sacred anointing oil's recipe for lay purposes, at pain of exile. A closed portion ends here.

In the continuation of the reading, God directed Moses make sacred incense from herbs—stacte, onycha, galbanum, and frankincense—to burn in the Tent of Meeting. As with the anointing oil, God warned against making incense from the same recipe for lay purposes. Another closed portion ends here with the end of chapter 30.