Terence Bellew MacManus (born 1811 or 1823 – 15 January 1861) was an Irish rebel who participated in the Young Irelander Rebellion of 1848.

His body was returned to Dublin for burial, where the Fenians gave him a large funeral in honor of his part in the rebellion.

After joining the Irish Confederation, he was among those who took part with William Smith O'Brien and John Blake Dillon in the July 1848 Young Irelander Rebellion in Ballingarry, County Tipperary.

MacManus was transported to Van Diemen's Land in Tasmania, Australia in 1849 on the Swift, together with O'Brien, Thomas Francis Meagher and Patrick O'Donoghue.

MacManus held a lynch court of Ellis among Irish emigrants for his betrayal of O'Brien in his escape attempt from Van Diemen's Land.

And now, my lords, this is, perhaps, the fittest time to put a sentence upon record, which is this - that standing in this dock, and called to ascend the scaffold - it may be to-morrow - it may be now - it may be never - whatever the result may be, I wish to put this on record, that in the part I have taken I was not actuated by enmity towards Englishmen - for among them I have passed some of the happiest days of my life, and the most prosperous; and in no part which I have taken was I actuated by enmity towards Englishmen individually, whatever I may have felt of the injustice of English rule in this island; I therefore say, that it is not because I loved England less, but because I loved Ireland more, that I now stand before you".