Prior to their suspensions, all four MPs had rebelled against the government on several occasions.
The group were among 47 Labour MPs who rebelled against the government's proposed cuts to welfare in July and forced ministers to water down their plans.
The rebellion undermined Prime Minister Sir Keir Starmer's authority, which was weakened after a series of policy reversals, including restoring the Winter Fuel Payment to millions of pensioners.
At the time of their suspension, Starmer said he was "determined" to change the country "for the better".
He said: "Therefore, we have to deal with people who repeatedly break the whip."
Hinchliff said he welcomed the whip back and added he had "constructive discussions" with the new chief whip in recent months.
