Glackin is a surname. Notable people with the surname include:
Doireann Ní Ghlacáin, Irish fiddler, sean-nós singer, and TV presenter. John Edward Glackin, birth name of Eddie Linden (1935–2023), Scottish-Irish poet Mary Glackin, American scientist Niall Ó Glacáin (c. 1563 – 1653), Irish physician in Italy Paddy Glackin (born 1954), Irish fiddler