Esther Alzaibar (born August 28, 1930, in San Juan, Puerto Rico) is a Puerto Rican ceramic artist.
She was a ceramics professor in the Institute Neumann from 1972 to 1976 and also taught at the School of Cristobal Rojas from 1974 to 1976.
She is seen as a pioneer for the art of ceramics, by being one of the founders of the Venezuelan Association of the Arts of Fire (Fuego) and for the significant pieces that are a part of the heritage of the Museum of Contemporary Art of Caracas.
Alzaibar founded an institution for teaching ceramics: the Ceramic School Workshop in 1973 and worked for 37 years.
Alzaibar first began doing ceramics when she divorced her husband with four children.
One of Alzaibar's friends recommended ceramics as a therapeutic method to alleviate her devastation from the divorce.