Hwang married musical theatre actress Kim Mi-hye on September 6, 2004. They have a son named Hwang Sae-hyun.
His younger brother is music director/composer Hwang Sang-jun.
On average, Hwang stars in three to four films a year. To critics who say that he does too many, Hwang responded, "I believe it is the responsibility of actors to try their best at acting when they come across screenplays that suit them. I breathe only when I act."