Department of Conservation rangers discovered a dead sperm whale at Marfells Beach, southeast of Blenheim, on Saturday morning.
DoC rangers were on the scene around 8.30am but were unable to assess the condition of the whale due to strong swells.
Marine mammal charity Project Jonah on a Facebook post said the next step was for local iwi to bless the whale before finding a suitable place to bury it.
"Department of Conservation rangers were quickly on the scene, but were unable to immediately assess the condition and species of the whale due to the strong swell that was rolling the whale around.