"Ma Boy" is the first single by South Korean girl group Sistar's sub-unit SISTAR19. It was released online as a digital single on May 3, 2011 through Starship Entertainment.

In April 28, 2011, it was announced the creation of the sub-unit SISTAR19. The new group, which features Sistar's main vocalist Hyorin and rapper Bora, debuted on May 3.

Sistar19 released the teaser for their single "Ma Boy" on April 28, 2011. The single was released on digital music sites on May 3, 2011. The official music video was unveiled on the same day.

On May 12, 2011 Sistar19 released a rehearsal video for their track, “Ma Boy”.

The song was written and produced by Brave Brothers.

A special version of "Ma Boy" was later included on Sistar's first full album "So Cool" which, in addition to the regular members of SISTAR19, included vocals from the two other SISTAR group members, Soyou and Dasom.

The song was included in sub-unit's 1st single album Gone Not Around Any Longer.

Sistar19 had their debut stage on M! Countdown on May 5, 2011. The group also performed "Ma Boy" on various music shows such as Music Bank, Music Core and Inkigayo in May and April.

The song debuted at number 2 on South Korea's Gaon Singles Chart. Ma Boy was no. 9 on Monkey3 's chart yearly.

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