A cook is a household staff member responsible for food preparation. The term can refer to the head of kitchen staff in a great house or to the cook-housekeeper, a far less prestigious position involving more physical labour.

The cook in an English great house was traditionally female; today's residences may employ a head cook or chef who may be of either gender.

The cook is responsible for the preparation of daily meals and menus, as well as menus for parties and other special occasions. The cook is also responsible for the ordering of food, the maintenance of the kitchen and for keeping accounts with local merchants. The holder of the position reports directly to the lady of the house or sometimes to the housekeeper.

The cook supervises all kitchen staff. In large households, especially at a noble or royal court, this comprises an elaborate hierarchy, at the bottom of which come the kitchen boys (who, despite the name, were not always minors), in the largest households even further subdivided, perhaps the lowliest position being that of spitboy or turnbrooch, who had to remain close to the hot fire to turn the roasting meat; there were six at Hampton Court palace in Henry VIII's reign.