It follows their eviction from two previous encampments in the area, at The Avenue and Langer Lane, in Wingerworth, since Easter.
A clean-up is now underway at Grassmoor Country Park.
A spokesperson for the task force set up to tackle the issue said: “The Illegal Encampment Task Force have met again to take action on the unauthorised encampment at Grassmoor Country Park.
"Derbyshire police, local councils and partners have worked together and can now confirm the Travellers have moved off the site.
“Friends of Grassmoor County Park have undertaken a litter pick and the park has been secured.”
Derbyshire’s police and crime commissioner Angelique Foster has praised the ‘strong and swift’ response.
She said the dedicated task force, being piloted in North East Derbyshire, has helped councils, police and other agencies to respond quickly to the issues created by illegal encampments.