Telford’s Princess Royal and the Royal Shrewsbury Hospital will both increase charges next month, for the first time in four years.
Bosses are introducing an hourly tariff, which they say will encourage "better flow and increased availability" for visitors.
Currently visitors pay £2.50 for up to two hours, £3 for two to five hours and £3.50 for five to 24 hours.
The changes will see visitors charged £3 for up to two hours, £4 for up to three hours, £5 for up to four hours, £6 for up to five hours, and £8 for 24 hours.
The free 30-minute parking period for patients and visitors will also be reduced to 20 minutes.
Julia Clarke, director of corporate governance at Shrewsbury and Telford Hospitals NHS Trust (SaTH), said: “This is the first change to car parking charges at SATH in four years and we are still among the lowest in the country, with people able to park for up to 20 minutes without charge.
"The 20 minutes without charge is useful for people who could drop off and pick up patients without incurring any parking charges."