Simon Lowth is to join BT Group in July as Group Finance Director and an executive board director.
He is known for driving cost transformation and performance improvement programmes, and brings much experience to BT having been CFO and served on the boards of three publicly listed companies - BG Group, AstraZeneca and ScottishPower over the past eleven years.
He has also been non-executive director at Standard Chartered Bank since 2010.
He will replace BT's current Finance Director, Tony Chanmugam, following a handover period.
Chanmugam will then move to focus on integrating the mobile network provider EE into BT for a period of time.
Lowth said: "Having acquired one of the UK's leading mobile operators and with superfast fibre broadband available to well over 24 million homes, BT is well-placed for growth in consumer, business and wholesale markets.
"I look forward to working with Gavin Patterson and the rest of BT's strong team to build upon the solid strategic and financial foundations already in place."
Gavin Patterson, BT Group Chief Executive, said: "Simon brings a wealth of experience to BT having served as CFO and a board director for a number of major international companies.
"On top of his solid financial acumen, his strong organisational leadership and engineering experience at a number of leading infrastructure companies will be a real asset for BT."