| Lydia Nāmāhāna Piʻia | |
| Office: | Governor of Oahu |
| Predecessor: | Oliver Holmes |
| Successor: | Boki |
| Birth Place: | Hawaii |
| Death Place: | Kingdom of Hawaii |
| Spouse: | Kamehameha I Gideon Peleioholani Laʻanui |
| Parents: | Keeaumoku Pāpaiahiahi Namahanaʻi Kaleleokalani |
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. They were married by Hiram Bingham I in a Christian ceremony.[2]
Nāmāhāna Piʻia also served as Governor of Oahu.