Anglican bishop, hymn writer, royal chaplain to Charles II of England, and one of seven bishops who in 1688 opposed James II's Declaration of Indulgence, which was designed to promote Roman Catholicism.

Ordained about 1661, Ken held several ecclesiastical positions until 1669, when he became a prebendary of Winchester Cathedral. In 1679 Ken was appointed chaplain to Princess Mary of York (Mary II), wife of Prince William of Orange (William III) and daughter of James, duke of York, who later became King James II. The following year Ken became royal chaplain to Charles II and soon after made his refusal to vacate his house in Winchester to the actress Nell Gwyn, Charles II's mistress. In 1685 he became bishop of Bath and Wells and the same year attended Charles on his deathbed.

In 1688 James reissued his Declaration of Indulgence for the second consecutive year. Though it seemed to promise toleration for Protestant dissenters, it was actually intended to win them to Roman Catholicism. Ken and six other bishops not only refused to publish it in their dioceses but published instead a petition against the order. Imprisoned in the Tower of London and tried for sedition, the bishops were subsequently acquitted. Despite this dispute, Ken remained loyal to James during the Glorious Revolution (1688–89), when William of Orange sailed from the Netherlands to England with an army to aid the Protestants. James fled the country, and William and Mary were crowned monarchs in 1689. For his refusal to swear allegiance to the new regime, Ken was deprived of his office in 1691 and spent the remaining 20 years of his life in retirement. His familiar hymns, "Awake, My Soul, and with the Sun" and "Glory to Thee, My God, This Night," were added to the seventh edition of his Manual of Prayers (1674) in 1700.