In the Genesis account, Noah’s Ark explicitly has one window or opening.
Genesis 6:16 instructs Noah to make a “window” or opening for the ark and to finish it within a cubit of the top. English translations vary in how they render the underlying Hebrew term, so some say “window,” while others use “opening” or a related architectural description.
The verse also specifies a door in the side and three levels. It does not provide a count of multiple windows, nor does it give a complete construction plan showing the opening’s exact shape. Consequently, “one” refers to the singular feature named in the text, not to a claim about every possible ventilation opening in a hypothetical physical vessel.
Later illustrations often depict many windows or bright cabin interiors, but those artistic choices go beyond Genesis. The canonical detail is a single explicitly mentioned opening near the top, alongside the side door and the three decks.