Line 10 (Turquoise) (Portuguese: Linha 10 – Turquesa), formerly Line D (Beige), is one of the seven lines operated by CPTM and one of the thirteen lines that make up the São Paulo Metro Rail Transport Network, in Brazil.

The Companhia Paulista de Trens Metropolitanos (CPTM) is a rapid transit and commuter rail company owned by the São Paulo State Department for Metropolitan Transports. It was created on 28 May 1992, from several railroads that already existed in Greater São Paulo, Brazil.