The menhir da Cabeça do Rochedo is an obelisk-like menhir made of limestone. It stands 500 m west of the N120 next to a quarry, on a hill north of the hamlet of Portelas and the city of Lagos in the municipality of Bensafrim, in the Algarve in Portugal.
The early Neolithic menhir is of considerable weight and size and has a decorative spiral-shaped engraving, which, however, can hardly be recognized. It is damaged in the middle by a large crack and broken off diagonally at the top.
The 259 menhirs of the Algarve are mainly characterized by their morphology, decoration and the archaeological context. They usually have a phallic, sub-conical or cylindrical shape and are concentrated in the extreme west of the province, which has few megalithic structures.