Allerton Garden, also known as Lāwaʻi-kai, is a botanical garden, originally created by Robert Allerton and John Gregg Allerton, located on the south shore of Kauai, Hawaii. The garden covers an 80-acre (320,000 m2) area and is situated beside the Lāwaʻi Bay, in a valley transected by the Lāwaʻi Stream. It is one of the five gardens of the non-profit National Tropical Botanical Garden.

Robert Henry Allerton, born in Chicago, Illinois, United States, was the son and heir of First National Bank of Chicago co-founder Samuel Allerton. He was a philanthropist who served as a trustee and honorary president for the Art Institute of Chicago, becoming one of its benefactors by donating thousands of artworks. He also became a trustee for the Honolulu Academy of Art, leaving a trust that funds the Academy to this day.