Isaac Penington (1616–1679) was one of the early members of the Religious Society of Friends (Quakers) in England.
He was the oldest son of Isaac Penington, a Puritan who had served as the Lord Mayor of London.
At other times Penington was charged with attending a Quaker meeting, which was forbidden by the Conventicle Act 1664.
Penington became an influential promoter and defender of the Quaker movement, writing extensively on many topics, and published several books.
[2] Penington married a widow named Mary Springett, a notable woman in her own right, and they had five children.