Gallimore is currently head of the Birmingham office of law firm Hogan Lovells and is a former head of planning at the company.
Gallimore, who has consistently featured in the top five individual solicitors in the annual Planning Law Survey for the past two decades, will join the company at the start of next year.
An announcement by Town Legal, a specialist planning law firm, on LinkedIn said: "We are very pleased to announce that Michael Gallimore returns to London to join us as our 10th partner (& 24th lawyer) on 2 January."
Gallimore has more than 30 years experience as a planning lawyer.
He advised developers Argent and King’s Cross Central Limited Partnership on the redevelopment of King’s Cross in London.
He also provided advice to the London Legacy Development Corporation on the Legacy Communities Scheme in the Queen Elizabeth Olympic Park.
In January 2017, he was replaced as head of Hogan Lovells' UK planning team by Claire Dutch.
In 2014, Gallimore was interviewed by Planning about the lessons he has learnt in his career so far.
He said: "Certain lawyers have a reputation for being a bit long-winded and will take several sentences to take something that can be said in one sentence. Clients just want the answer, not the thought processes that got you there."
His appointment is the latest high profile addition to the Town Legal team.
Last month, Town Legal announced that Louise Samuel, the former head of planning at Linklaters, would be joining as its ninth partner. She was due to join the firm last week.
In April, Duncan Field arrived at the firm from his previous role as head of planning at Norton Rose Fulbright.
Town Legal was launched in January 2017 by partner Simon Ricketts and was voted as the top-ranking law firm in the 2019 Planning Law Survey.