Count Alfred Émilien O'Hara van Nieuwerkerke (16 April 1811, Paris – 16 January 1892, Gattaiola, near Lucca) was a French sculptor of Dutch descent (his grandfather was the illegitimate son of a minor stadthouder) and a high-level civil servant in the Second French Empire.
He is also notable as the lover of Princess Mathilde Bonaparte, after her estrangement from her husband Anatole Demidov.