Sentientism is a primary belief orientation of the philosophy of Astronism and is classified as one of The Seven Tenets of Association. Sentientism is characterised by the belief that there exists both sentient and non-sentient life beyond that of humanity and beyond The Earth; this is a pre-Millettic belief that was organised by Cometan in the philosophy of Astronism. 

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Sentientism is considered to be one of the most prominent beliefs of Astronism and one that defines the philosophy from the majority of other religious and philosophical traditions which the existence of sentient life beyond humanity, the tradition is either opposed to or does not address at all.