Huntington will arrive in a fortnight as director of corporate affairs UK, a position vacated by Maxine Taylor, who is joining Cancer Research (PRWeek, 4 February).
Lilly - the firm behind antidepressant Prozac - will review the size of its UK comms team.
In a statement, Lilly said: 'Erin's appointment provides the opportunity to review corporate affairs.'
Lilly UK has around 15 comms staff spread across four divisions: NHS and government relations, product comms, corporate relations and internal comms and health outcomes.
Huntington is currently in the Washington-based role of global government affairs manager (Europe); she has also held roles as manager of international public and government relations (Latin America and Canada).
She is a former legislative assistant for Republican senator Richard Lugar.