Margarita Pin Arboledas (born 18 March 1949 in Valencia, Spain) is a Spanish politician who belongs to the governing Spanish Socialist Workers' Party (PSOE).
Married with three children, Pin first worked as a social worker and also worked for the Valencian regional administration before entering politics in 1995 when she was elected as a councillor for Sagunto and also served as a member of the Valencian Regional assembly from 1995 to 1996.
For the 2000 election she was placed lower down the PSOE list in seventh place in a district where the party had won only six seats at the previous election.
She was re-elected in 2004 and was the most active PSOE deputy in the three Valencian provinces in the first 21 months of the Congress being credited with 346 legislative interventions.
With the replacement of Inmaculada Rodríguez-Piñero by José Luís Ábalos Meco in April 2009, she is currently first in line to substitute any PSOE deputy for Valencia Province who resigns or dies.