Which is the smallest lobe?

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The liver’s lobes differ in size, and the caudate lobe is the smallest. It sits on the visceral (inferior) surface, tucked between the inferior vena cava and the porta hepatis, distinct from the larger right and left lobes. The right lobe covers most of the diaphragmatic surface and is the largest, while the left lobe is also substantial. The quadrate lobe is a small region on the inferior surface near the gallbladder, but it is still typically larger than the caudate. So the caudate lobe, due to its small size and posterior location, is the smallest of the named lobes.