On January 7 1915 the Elim Evangelistic Band was launched in Ireland under the leadership of George Jeffreys, a missionary who came to faith during the Welsh Revival.
The band's work across Ireland over the next five years led to 15 Elim churches being opened. From there the denomination was born and today, Elim has hundreds of churches across the UK and works in over 40 countries around the world.
Although today is about celebration, Mark Ryan who was one of the organisers of the centenary events said it's about looking forward and not back.
Speaking to Premier, he said: '[The church] has come a long way and obviously we're delighted with that but our main focus today is to say we don't want to rest on our laurels but to now repurpose and revision for the future."
The celebrations will go on throughout the year, culminating in a series of regional events in the Autumn.
Hear Elim Pastor Mark Ryan speaking with Premier's Marcus Jones: