Tectus architectonicus is a species of sea snail, a marine gastropod mollusk in the family Tegulidae.

The whorls are flat, subimbricating, and longitudinally costate.

The base of the shell is flat, and concentrically strongly lirate.

The columella is short, tortuous, and truncate anteriorly.

[2] The species occurs off Indo-Malaysia, Oceania, and Western Australia.