Lydia Nāmāhāna Kekuaipiʻia (c. 1787 – 1829[1]) was a wife of King Kamehameha I of Hawaii.

She was the daughter of Keʻeaumoku Pāpaʻiahiahi, and her sisters Kaʻahumanu and Kalākua Kaheiheimālie were also Kamehameha's wives.

Kamehameha and Kaʻahumanu later arranged Piʻia to marry Gideon Peleioholani Laʻanui, who was ten years her junior.

[2] Nāmāhāna Piʻia also served as Governor of Oahu.

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