On May 31, 1889 the Hawera club convened a meeting in Hawera, of delegates from the Hawera, Waimate (Manaia), New Plymouth, Okaiawa, and Eltham clubs.
This meeting agreed to form the Taranaki Union. During the year Stratford and Midhirst clubs united as Manganui club, Tikorangi and Waitara clubs combined as Clifton club, and Inglewood and New Plymouth Star clubs were and among others founded and became part of the union.
By the turn of the century, Taranaki R.F.U. had produced eleven All Blacks, six of whom toured Great Britain in 1905.
Taranaki currently plays in the professional Mitre 10 Cup, which it won in 2014.