Josh Smith had 24 points, Mike Bibby scored 15 and Al Horford added 12 points and 14 rebounds for the Hawks, who have won six straight games and nine of 10.
Danny Granger had 25 points, Jarrett Jack 22 and Jeff Foster finished with 12 points and 12 rebounds for the Pacers in their fourth consecutive loss.
After the Pacers cut Atlanta's lead to one on Jack's three-point play with 1:36 left, Johnson drained a 3-pointer to make it 108-104. Granger missed a layup on the Pacers' ensuing possession, and Johnson hit two free throws to finish the scoring.
The Hawks were playing their first road game since Dec. 12. They played eight consecutive home games and went 7-1 during that stretch.
Atlanta snapped a four-game losing streak at Conseco Fieldhouse.
Following a back-and-forth first half that featured 12 lead changes and nine ties, the Hawks took an 81-75 lead on Smith's jumper late in the third quarter. The Pacers answered with consecutive 3s by Travis Diener to tie the score, but Atlanta went ahead 85-83 to end the period.
The Hawks took a 103-96 advantage after five straight points from Johnson with 4 minutes left in the fourth quarter. The Pacers then used an 8-2 run to get within a point.
NOTES: Atlanta coach Mike Woodson returned to his hometown of Indianapolis. He attended nearby Broad Ripple High School and went to college at Indiana University. ... Pacers G Mike Dunleavy (right knee) missed the game and has yet to play this season. ... Granger completed a four-point play in the third quarter after being fouled on a 3-pointer. ... Atlanta's Marvin Williams and Indiana's Marquis Daniels each received technical fouls in the third.
Atlanta Hawks' Joe Johnson (2) drives around Indiana Pacers' Jeff Foster, left, during the first half of an NBA basketball game in Indianapolis, Tuesday, Dec. 30, 2008. Johnson led all scorers with 27 points as Atlanta won 110-104. (AP Photo/Tom Stra
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