The Koren Siddur refers to a family of siddurim published by Koren Publishers Jerusalem beginning in 1981.[1]
Eliyahu Koren began work on a new prayerbook in the 1970s. Koren created Koren Book Type for the project.[2] Rather than allow the text to run continuously across page turns, Koren maintained lines and paragraphs within individual pages. He set individual sentences line by line, according to their meaning. The result was a prayerbook published in 1981. The siddur became one of the most widely used Hebrew-only prayerbooks. In 2009, Koren Publishers Jerusalem introduced a new Hebrew/English edition of the Koren Siddur, the Koren Sacks Siddur (below), with an introduction, translation, and commentary by the Orthodox Ashkenazi Chief Rabbi of the United Hebrew Congregations of the Commonwealth, Lord Jonathan Sacks. More recently, Koren Publishers Jerusalem released the Koren Shalem Siddur, which built upon both the previously released Koren Sacks and original Koren Siddurs. The new Shalem Siddur contained all Torah readings, the Five Megillot, and personal supplications (tehinot).[3]