Hi guys,
Does anyone know action research is a "Method" or "Methodology"?

Thanks guys.

I would say Action Research is a Methodology.
Methods used to conduct an Action Research could be participant observation, case study, qualitative methods, quantitative, experiments, evaluation etc.
You also need to think about the ontology and epistemology, I would say for Action Research it maybe pragmatism or critical theory.

This book may be helpful: