On January 18, 2015, Kelly signed a minor league contract with the Miami Marlins.

When Miami played Detroit in a spring training game in Lakeland, Florida, Kelly received a standing ovation from Tigers fans.

After hitting .270 with two doubles and five RBI with .681 OPS in Spring training, the Marlins purchased Kelly's contract and placed him on the Opening Roster.

Kelly suffered a fractured finger early in the 2015 season and was placed on the 15-day disabled list on April 13.
Kelly had two at-bats before getting hurt and was 0-for-2.

On July 18, 2015, the Marlins announced that Kelly would have season-ending Tommy John surgery.

On February 3, 2016, Kelly re-signed with the Marlins to a minor league deal with an invitation to spring training.
He was released by the Marlins on March 29 and re-signed the next day.
Kelly was called up from New Orleans on July 6.

With the return of Dee Gordon to the Marlins roster after an 80-day suspension for PED use, Kelly was designated for assignment on July 28, 2016.
On January 18, 2015, Kelly signed a minor league contract with the Miami Marlins.
When Miami played Detroit in a spring training game in Lakeland, Florida, Kelly received a standing ovation from Tigers fans.
After hitting .270 with two doubles and five RBI with .681 OPS in Spring training, the Marlins purchased Kelly's contract and placed him on the Opening Roster.
Kelly suffered a fractured finger early in the 2015 season and was placed on the 15-day disabled list on April 13. Kelly had two at-bats before getting hurt and was 0-for-2.
On July 18, 2015, the Marlins announced that Kelly would have season-ending Tommy John surgery.
On February 3, 2016, Kelly re-signed with the Marlins to a minor league deal with an invitation to spring training. He was released by the Marlins on March 29 and re-signed the next day. Kelly was called up from New Orleans on July 6.
With the return of Dee Gordon to the Marlins roster after an 80-day suspension for PED use, Kelly was designated for assignment on July 28, 2016.
Don Kelly (baseball)