Transmaçor (Portuguese: Transmaçor – Transportes Marítimos Açorianos, Lda) was a sea transport/ferry operator in the Central Group of islands of the Azores, headquartered in the city of Horta, on the island of Faial.

[1] These included the Empresa das Lanchas do Pico, Lda., operator of the inter-island launches Espalamaca and Calheta; Empresa Açoriana de Transportes Marítimos, Lda, that operated the yacht Terra Alta; and Transcanal – Transportes Marítimos do Canal, Lda, owners of the traditional seagoing launches Picaroto and Manuel José.

[1] In 2011, the Regional Government of the obtained 88.37% of the common shares, with the remaining 11.63% stake taken by Empresa Açoriana de Transportes Marítimos, Lda.

[2] Fraga indicated that it was necessary to "rationalize the [maritime] system, evolving into an integrated management of Atlânticoline and Transmaçor, by fusion, that permitted the desired economies of scale and a better optimization of operational results", noting that "on concluding, the construction of two new mixed-transport vessels for passengers and vehicles" was necessary (then in construction).

While maintaining the brand Atlanticoline, the Government of the Azores would reform the new entity at the end of the mandate of the old Atlanticoline administrative council on 31 December 2013,[3] but maintain the daily operation independent.