Jehovah () is a Latinization of the Hebrew יְהֹוָה‎ Yəhōwā, one vocalization of the Tetragrammaton יהוה‎ (YHWH), the proper name of the God of Israel in the Hebrew Bible/Old Testament. The Tetragrammaton יהוה is considered one of the seven names of God in Judaism and a form of God's name in Christianity.

The consensus among scholars is that the historical vocalization of the Tetragrammaton at the time of the redaction of the Torah (6th century BCE) is most likely Yahweh. The historical vocalization was lost because in Second Temple Judaism, during the 3rd to 2nd centuries BCE, the pronunciation of the Tetragrammaton came to be avoided, being substituted with Adonai ("my Lord"). The Hebrew vowel points of Adonai were added to the Tetragrammaton by the Masoretes, and the resulting form was transliterated around the 12th century CE as Yehowah. The derived forms Iehouah and Jehovah first appeared in the 16th century.

The vocalization of the Tetragrammaton Jehovah was first introduced by William Tyndale in his translation of Exodus 6:3, and appears in some other early English translations including the Geneva Bible and the King James Version. The United States Conference of Catholic Bishops states that in order to pronounce the Tetragrammaton "it is necessary to introduce vowels that alter the written and spoken forms of the name (i.e. "Yahweh" or "Jehovah")." Jehovah appears in the Old Testament of some widely used translations including the American Standard Version (1901) and Young's Literal Translation (1862, 1899); the New World Translation (1961, 2013) uses Jehovah in both the Old and New Testaments. Jehovah does not appear in most mainstream English translations, some of which use Yahweh but most continue to use "Lord" or "LORD" to represent the Tetragrammaton.