Political Director Simon Gass would discuss a "range of bilateral and international issues" with Iranian officials, the Foreign Office in London said.
Gass is also Britain's lead negotiator in talks on Iran's nuclear programme and was Britain's ambassador in Tehran between 2009 and 2011.
Ties between Britain and Iran have recently warmed, with newly-named non-resident charges d'affaires making a series of trips between Tehran and London.
"Sir Simon's visit is the next stage in the step-by-step approach to improving relations between our two countries," a Foreign Office statement said.
According to a Tehran-based Western diplomat aware of the trip, the visit is about reopening Britain's embassy in Tehran, not upcoming talks on Iran's disputed nuclear programme.
Britain shuttered the embassy when hundreds of Islamist students stormed the compound in November 2011, and then ordered the closure of Iran's mission in London.
The students -- protesting against Western sanctions over Tehran's disputed nuclear programme -- ransacked the building as well as the ambassador's residence in north Tehran.
Iran and Britain officially resumed diplomatic relations in February.
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