Grundtvig International Secondary School is a Nigerian independent boarding school in Oba, Anambra State. It is named after Danish philosopher N. F. S. Grundtvig and is built upon his folk high school education-for-life principles for education. It educates boys and girls 12 to 18 years old and was founded in 1998 by Dr. Kachi Ozumba Snr (1942-2011). The school won the 2013 Science Teachers Association of Nigeria (STAN) Mathematics Competition in Anambra State.