Thomas Alexander Peterkin (1839 – 12 June 1926) was a British born New Zealand engineer and politician who was mayor of Lower Hutt.

He rejoined the railways department, working at Hillside and Addington, and was again manager at Westport for seven years.

[1] In 1907 he was elected Mayor of Lower Hutt, defeating borough councillors Albert Burton Clark and Frederick de Jersey Clere for the position.

By the time Peterkin retired as mayor the council had almost no money left for any further expenditure.

After he left office an independent audit of the council's finances and its £7,000 debt was held but found no corruption or willful mismanagement by Peterkin and the council members, though City Engineer Henry Rix-Trott would resign over the matter in 1910.