The Crown Prosecution Service (CPS) is to shut three of its Westcountry offices.
The offices in Truro, Plymouth and Taunton are to be shut down and a further office in Gloucester will also close.
The revelation comes as lawyers prepare to unite for a minute of action tomorrow as they warn about the devastating effects of legal aid cuts.
The CPS says it will centralise its work from two main hubs in Exeter and Bristol.
A CPS spokeswoman confirmed the closures and said they were part of the Government's spending review.
But she said there will be no job losses or compulsory redundancies.
However, lawyers claim that more courts in the region face closure and court staff including legal advisers also face the axe as fewer people are being charged by the police and being brought to court.
The Courts and Tribunal Service did not respond to questions about cuts in court staff and the CPS nationally also failed to answer questions about national cuts in staff and bases.
Tomorrow morning at 9.59am precisely barristers and lawyers will stage a one minute protest outside Exeter Crown Court as part of a nationwide 'moment of unity'.
The Law Society is backing the national move which has been organised by Exeter solicitor Rachel Bentley from Trinity Advocates.
The Law Society says the legal aid cuts could have 'devastating and irreversible consequences' and could 'destroy the justice system and leave defendants, the police and the courts – and ultimately the taxpayer – paying a far higher price'.
Law Society Chief Executive Desmond Hudson said: "This one minute of action will draw attention to these Government plans which we believe are unworkable and possibly unlawful."
A CPS spokeswoman in Bristol said the office closure plans were still at a very early stage and they did not have a "finalised timeline for the proposed office closures".
But she said: "We will not be pulling the rug from under our staff. There should be no real impact on the public."
One of the solicitors taking part in the protest has accused the Ministry of Justice of wasting public money which could be used to retain the legal aid system.
Stephen Nunn of Exeter-based Nunn Rickard solicitors claimed the Ministry of Justice spent £5.1 million for taxis last year, £1.1 million for dog food, £83,000 on hair stylist fees at three jails, a 'staggering' £330,000 bill for estates and building maintenance and £262,000 to host a Foreign and Commonwealth Office conference.
Mr Nunn said the Government attack on the Criminal Justice System will cause "long lasting and perhaps irreparable damage" to a system that was once the envy of the world and provided access to justice by all, rich or poor.