Isaac (; , ISO 259-3 Yiçḥaq, "[he] will laugh"; Isaak or ) as described in the Hebrew Bible and the Qur'an, was the second son of Abraham, the only son Abraham had with his wife Sarah, and the father of Jacob and Esau. According to the Book of Genesis, Abraham was 100 years old when Isaac was born, and Sarah was past 90.

Isaac is a given name derived from Judaism and can refer to:

• Isaac, one of the patriarchs of the Jewish, Christian, and Islamic faiths
• Isaac (name), including a list of people with the given name or surname of Isaac and its variants