Alfonso[1] Barrantes Lingán (San Miguel de Pallaques, November 27, 1927 – Havana, December 2, 2000) was a Peruvian politician in the mid-1980s who served as Mayor of Lima from 1984 to 1986.

He studied law at the National University of San Marcos and became involved with the APRA party which eventually became his political enemy.

During his mayoral term, he was known as El Frejolito (Little Bean) and was known for his campaign to ensure a daily glass of milk for every child in Lima.

He withdrew before the runoff and Alan García of the APRA was elected president.

In 1990, he ran again but placed 5th and Alberto Fujimori was elected president in the runoff against Mario Vargas Llosa.