A typical 1 cup serving of canned pineapple contains 1 grams of protein (0.42 g per 100 g), which makes it only a minor source of protein. That covers roughly 2% of the 50 g reference Daily Value, so it adds toward your protein total for the day.
Only about 3% of the calories in canned pineapple come from protein, so it is more of an energy food than a protein food. It is worth eating for other reasons; the protein it adds to a day is incidental.
Among the 71 fruits in the database, canned pineapple ranks 41st by protein per serving, and 729th out of all 796 foods on the site. Set against apple, another fruit entry in the database, a serving carries about 0.5 g more protein (apple has 0.5 g per 1 medium).
It is an incomplete protein on its own; pairing it with other plant foods across the day covers the full range of essential amino acids. The serving above is measured by volume at 249 g. The per-100 g figure lets you compare it directly against any other food here, whatever its serving.
Source: USDA FoodData Central #169126 - "Pineapple, canned, juice pack, solids and liquids" (SR Legacy, published 4/1/2019). Values are the published reference figures for that record, not lab measurements for a specific brand or batch.
Quick answers
Canned pineapple protein FAQ
How much protein is in canned pineapple per 100 g?
Canned pineapple has 0.42 g of protein per 100 g. A typical 1 cup serving (249 g) provides 1 g.
Is canned pineapple a complete protein?
No. Canned pineapple is an incomplete protein on its own; pairing it with other protein sources across the day covers the full range of essential amino acids.
How much of the Daily Value does a serving of canned pineapple cover?
A 1 cup serving of canned pineapple contains 1 g of protein, about 2% of the 50 g reference Daily Value.
Is canned pineapple a good source of protein?
Canned pineapple is only a minor source of protein, and about 3% of its calories come from protein, which makes it more of an energy food than a protein food. Set against apple, another fruit entry in the database, a serving carries about 0.5 g more protein (apple has 0.5 g per 1 medium).