A novel maize variety designated PH266F and seed, plants and plant parts thereof. Methods for producing a maize plant that comprise crossing maize variety PH266F with another maize plant. Methods for producing a maize plant containing in its genetic material one or more traits introgressed into PH266F through backcross conversion and/or transformation, and to the maize seed, plant and plant part produced thereby. Hybrid maize seed, plant or plant part produced by crossing the variety PH266F or a locus conversion of PH266F with another maize variety.
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