John Cook (1730–1789) was an American planter and politician from Smyrna, in Kent County, Delaware.
Like many of his Anglican neighbors in Kent County, Cook was fundamentally opposed to the break with Great Britain and was counted among the conservatives whose loyalty to the new government was suspect.
However, he was personally liked and was elected to the more conservative Delaware Constitutional Convention of 1776 and to the first State House for the 1776/77 session.
Before he was allowed to take office, however, the appointment was blocked and David Finney, the cousin of Thomas McKean, was given the seat.
During the proceedings Clow was able to produce papers to prove his claim to have had a British commission and the jury acquitted him.
Cook died at Duck Creek, now Smyrna, and was buried there in an unmarked grave at St. Peter's Episcopal Church Cemetery.
However, Cook served as State President only temporarily, filling the vacancy created by the resignation of John Dickinson and awaiting the selection of a successor by the General Assembly.