Tobias Reynald Marcelo Tiangco (born November 21, 1967) is a Filipino businessman and politician currently serving as congressman for Navotas' lone district since 2022, position he previously held from 2010 to 2019.

Tiangco attended primary and secondary education at Xavier School in San Juan and later graduated with a Bachelor's degree in Management from Ateneo de Manila University in 1989.

Tiangco ran for a fresh term with running mate Lutgardo Cruz, but Patrick Joseph Javier, an independent, won the vice-mayoral seat.

Tiangco ran for Congress unopposed and assumed office on June 30, 2010, as the first representative of Navotas's at-large congressional district.

In 2012, Tiangco served as a state witness at the impeachment trial of Supreme Court Chief Justice Renato Corona.

Tiangco succeeded his younger brother, John Rey, who in turn took his vacated seat as representative for the lone district of Navotas.

He donated his salary from April 2020 to the end of his term in June 2022 worth almost ₱3.3 million to families who are not part of the national government's emergency subsidy program.