Jerusalem Day is an Israeli national holiday that commemorates the "reunification" of East Jerusalem with West Jerusalem following the Six-Day War of 1967, which saw Israel occupy East Jerusalem and the West Bank, effectively annexing the former. It is celebrated annually on 28 Iyar on the Hebrew calendar, and is marked officially throughout Israel with state ceremonies and memorial services.

The Israeli annexation of East Jerusalem, known to Israelis as the reunification of Jerusalem, refers to the Israeli occupation of East Jerusalem during the 1967 Six-Day War, and its annexation.