Antonio Andres Bonnin Muhlach (; born November 5, 2001) is a Filipino actor and model. He is the son of Aga Muhlach and Charlene Gonzales and the twin brother of Atasha Muhlach. He is best known for his role as Mark Keifer Watson on the web series Ang Mutya ng Section E (2025).
Muhlach was born on November 5, 2001, at Makati Medical Center in Makati, Metro Manila, to actor Aga Muhlach and former beauty queen, model, and host Charlene Gonzales. He has a twin sister, Atasha Muhlach, who was born two minutes older, and an older half-brother, Luigi "Iggy Boy" Muhlach, Aga's son with actress Janice de Belen. He and Atasha were baptized as Catholics on January 8, 2002, in Muntinlupa.
He graduated high school from Brent International School in Biñan, where he played for the school's basketball team, and later went to Madrid to study business and communications at Saint Louis University. Upon joining the Philippine entertainment industry, Muhlach left the university and returned to the Philippines, where he finished school in Metro Manila.
Muhlach, still four years old, first appeared in family-centered commercials for Jollibee, alongside his celebrity parents and twin sister Atasha. The Muhlach family were also endorsing brands such as Toyota and Selecta.
In January 2024, Muhlach launched his professional career after signing an exclusive contract with Manny V. Pangilinan, chief executive of MVP Group of Companies, and Vic del Rosario, chairperson of Viva Communications.
His first television project is the family sitcom Da Pers Family, which aired on TV5 in July 2024. Muhlach was cast as Mark Keifer Watson, the male lead in the teen romance comedy series, Ang Mutya ng Section E. The Viva One series has garnered significant traction among global audiences.
Muhlach won the Best New Male TV Personality award at the 38th PMPC Star Awards for Television in April 2025.
In October 2025, it was announced that Muhlach would join the cast of the musical adaptation of the 1984 coming-of-age film Bagets, which starred his father, Aga Muhlach, as the boy-next-door Adie. The younger Muhlach also played Adie in the musical, which ran from January to March 2026 at the Newport Performing Arts Theater in Pasay.
Muhlach has also appeared on several magazine covers and editorial features.