A typical 10 small olives serving of black olives contains 0.3 grams of protein (0.84 g per 100 g), which makes it only a minor source of protein. That covers roughly 1% of the 50 g reference Daily Value, so it adds toward your protein total for the day.
Only about 3% of the calories in black olives 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 105 vegetables in the database, black olives ranks 99th by protein per serving, and 786th out of all 796 foods on the site. Set against eggplant, another vegetable entry in the database, a serving carries about 0.5 g less protein (eggplant has 0.8 g per 1 cup cooked).
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 counted by piece at 32 g. Because pieces vary, the per-100 g figure is the one to use when comparing this against a food measured a different way.
Source: USDA FoodData Central #169094 - "Olives, ripe, canned (small-extra large)" (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
Black olives protein FAQ
How much protein is in black olives per 100 g?
Black olives has 0.84 g of protein per 100 g. A typical 10 small olives serving (32 g) provides 0.3 g.
Is black olives a complete protein?
No. Black olives 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 black olives cover?
A 10 small olives serving of black olives contains 0.3 g of protein, about 1% of the 50 g reference Daily Value.
Is black olives a good source of protein?
Black olives 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 eggplant, another vegetable entry in the database, a serving carries about 0.5 g less protein (eggplant has 0.8 g per 1 cup cooked).