Smoltz met his first wife Dyan Struble at the Omni Hotel in downtown Atlanta; the couple had four children before divorcing in 2007 after 16 years of marriage.
Smoltz lives in Alpharetta, Georgia and also has a home at Sea Island, a golf resort.
On May 16, 2009, Smoltz married Kathryn Darden at his home with 70 friends and family in attendance.
Smoltz is a Christian.

Smoltz is a good friend of pro golfer Tiger Woods, the two often play golf together.
Woods has stated that Smoltz is the best golfer outside of the PGA Tour that he has seen.
Smoltz has stated that he once had a plus 4 handicap.
In 2018, Smoltz qualified for the U.S. Senior Open, one of senior golf's major championships.
He is also involved in the sport of bowling.

Smoltz plays every year in the American Century Championship at Lake Tahoe.
He won the Diamond Resorts Tournament of Champions in Orlando in January, 2019.

Smoltz counts Doc Rivers as a personal friend dating back to Rivers' playing days in Atlanta.
In the January 12, 2008 edition of the Boston Globe, Rivers is quoted as saying, "I offered him my apartment... I just told him about Terry and the Red Sox organization.
I told him it's a no-brainer."

Smoltz is also an accomplished accordionist and has starred in a television commercial for The Home Depot.

Smoltz is a distant cousin of fellow Baseball Hall of Famer Charlie Gehringer.
Smoltz met his first wife Dyan Struble at the Omni Hotel in downtown Atlanta; the couple had four children before divorcing in 2007 after 16 years of marriage. Smoltz lives in Alpharetta, Georgia and also has a home at Sea Island, a golf resort. On May 16, 2009, Smoltz married Kathryn Darden at his home with 70 friends and family in attendance. Smoltz is a Christian.
Smoltz is a good friend of pro golfer Tiger Woods, the two often play golf together. Woods has stated that Smoltz is the best golfer outside of the PGA Tour that he has seen. Smoltz has stated that he once had a plus 4 handicap. In 2018, Smoltz qualified for the U.S. Senior Open, one of senior golf's major championships. He is also involved in the sport of bowling.
Smoltz plays every year in the American Century Championship at Lake Tahoe. He won the Diamond Resorts Tournament of Champions in Orlando in January, 2019.
Smoltz counts Doc Rivers as a personal friend dating back to Rivers' playing days in Atlanta. In the January 12, 2008 edition of the Boston Globe, Rivers is quoted as saying, "I offered him my apartment... I just told him about Terry and the Red Sox organization. I told him it's a no-brainer."
Smoltz is also an accomplished accordionist and has starred in a television commercial for The Home Depot.
Smoltz is a distant cousin of fellow Baseball Hall of Famer Charlie Gehringer.
John Smoltz