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The title compounds, 4-(diiodo­arsanyl)benzoic acid, (I), and 3-(diiodo­arsanyl)benzoic acid, (II), both [As(C7H5O2)I2], which possess a -COOH coordinating group, form mol­ecular crystal structures composed of hydrogen-bonded dimers, the packing differences of which are caused by the relative position of the diiodo­arsan­yl groups. The para isomer, with Z' = 1, crystallizes in a layered structure with shortened contacts of the As atoms to only the arene rings of adjacent mol­ecules. In contrast, the meta isomer, with Z' = 3, forms separate recta­ngular blocks of three ribbons, each composed of dimeric mol­ecular units positioned almost directly above each other and with the As atoms possessing only two As...I contacts to the I atoms of neighbouring mol­ecules.
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