Daniel Hartman Kress (June 27, 1862 – November 2, 1956) was a Canadian physician, anti-smoking activist, Seventh-day Adventist missionary and vegetarian.

[2] He specialized in internal medicine at Battle Creek (1894–1898) and was medical director at Meadvale Sanitarium and Hospital at Surrey Hill, London (1898–1900).

[6] Kress patented a mouthwash which contained a weak nitrate solution which he believed would cure all craving for cigarettes.

[2] He lectured at the Christchurch Art Gallery on food reform, condemning alcohol and meat consumption.

However, he received a letter from Ellen G. White which advised he be given fresh-beaten eggs in grape juice, as "this will supply that which is necessary for your system".

[2] Kress opposed the consumption of mustard, peppers, pickles and spices as they created a thirst for alcohol and were "not designed to be fed into the human body".

[2] In 1909, Kress and his wife authored the Good Health Cookery Book which contains meatless recipes based around cereals, fruits and vegetables.

The Kresses advised two meals a day and suggested nutmeat or protose (a mixture of nuts and gluten) as substitutes for meat.