Guido da Velate (also Guy or Wido) (died 1071) was the Archbishop of Milan from 1045 until his death, though he had simoniacally abdicated in 1067.
He had been chosen as successor to Aribert by the people in opposition to the choice of the noblesse and confirmed as archbishop by the Emperor Henry III.
Because he also refused to abide by the compromise of 1044, which would have limited his powers, he found himself at odds with the communards and the lesser nobility as well as the reform school.
After the death of Henry III in 1056, Hildebrand, Anselm of Baggio, and Peter Damian were sent to settle matters in Milan, but to little avail.
The peace they brokered was broken incessantly until 1067, when Guido gave up his see and recommended the subdeacon Gotofredo da Castiglione to the Emperor Henry IV (for a price).