Kirk Matthew Lankford (born 1985) is an American from Kalihi, Hawaii who was convicted of murdering a Japanese tourist in Pūpūkea, Hawaii.

On April 12, 2007, Japanese tourist Masumi Watanabe disappeared in Pūpūkea. Lankford was arrested and charged with second-degree murder on April 26, 2007, after police found blood and items belonging to Watanabe in his pickup truck. Watanabe's body was never found, but the blood in Lankford's truck was determined to have been Watanabe's.