January 06, 2021

Art Warren traded from Rangers  to Reds 

January 23, 2021

Cionel Perez traded from Astros  to Reds 

February 08, 2021

Reds  sign Sean Doolittle as a free agent

February 11, 2021

Reds  sign Dee Strange-Gordon

February 16, 2021

Reds  sign Cam Bedrosian

February 18, 2021

Reds  sign Tyler Naquin

March 10, 2021

Reds  place Joey Votto on the injured list

March 12, 2021

Mike Freeman traded from Indians  to Reds 

March 22, 2021

Reds  sign Heath Hembree as a free agent

March 27, 2021

Reds  release Noe Ramirez

April 01, 2021

Reds  place Sonny Gray on the injured list

Reds  place Michael Lorenzen on the injured list

Reds  place Shogo Akiyama on the injured list

Reds  designate Edgar Garcia for assignment

April 14, 2021

Reds  place Michael Lorenzen on the injured list

April 16, 2021

Reds  place Aristides Aquino on the injured list

April 17, 2021

Reds  place Alex Blandino on the injured list

Reds  designate Cam Bedrosian for assignment

April 20, 2021

Reds  place Mike Moustakas on the injured list

April 25, 2021

Reds  place Aristides Aquino on the injured list

April 30, 2021

Reds  place Jonathan India on the injured list

May 01, 2021

Reds  sign Brad Brach

May 02, 2021

Reds  designate Phillip Diehl for assignment

May 07, 2021

Reds  place Joey Votto on the injured list

May 14, 2021

Reds  designate Sal Romano for assignment

May 17, 2021

Sal Romano became a free agent

May 20, 2021

Reds  place Mike Moustakas on the injured list

May 21, 2021

Reds  place Wade Miley on the injured list

Reds  place Nick Senzel on the injured list

Reds  designate Carson Fulmer for assignment

May 27, 2021

Reds  place Jeff Hoffman on the injured list

June 01, 2021

Reds  place Michael Feliz on the injured list

Reds  place Max Schrock on the injured list

June 05, 2021

Reds  place Alex Blandino on the injured list

June 08, 2021

Reds  place Michael Feliz on the injured list

June 09, 2021

Reds  place Sonny Gray on the injured list

June 11, 2021

Reds  place Tejay Antone on the injured list

June 13, 2021

Reds  place Nick Senzel on the injured list

June 19, 2021

Reds  place Mike Moustakas on the injured list

June 23, 2021

Reds  place Joey Votto on the injured list

June 24, 2021

Reds  place Lucas Sims on the injured list

Reds  sign Daniel Duarte

June 26, 2021

Reds  place Tejay Antone on the injured list

June 28, 2021

Reds  designate Scott Heineman for assignment

July 08, 2021

Reds  place Sonny Gray on the injured list

July 15, 2021

Reds  place Art Warren on the injured list

July 16, 2021

Reds  place Alex Blandino on the injured list

July 19, 2021

Reds  place Michael Lorenzen on the injured list

Reds  designate Mark Payton for assignment

Reds  designate Jose De Leon for assignment

July 23, 2021

Reds  place Nick Castellanos on the injured list

Reds  release Jose De Leon

July 24, 2021

Reds  place R.J. Alaniz on the injured list

Mark Payton traded from Reds  to Mets 

July 28, 2021

Reds  place Luis Cessa on the injured list

Reds  designate Josh Osich for assignment

Reds  designate Ashton Goudeau for assignment

Reds  designate Edgar Garcia for assignment

July 29, 2021

Ashton Goudeau traded from Reds  to Rockies 

August 05, 2021

Reds  sign Ender Inciarte

August 06, 2021

Reds  place Michael Feliz on the injured list

August 08, 2021

Reds  place Brad Brach on the injured list

August 11, 2021

Reds  place Art Warren on the injured list

August 15, 2021

Reds  designate Mike Freeman for assignment

August 16, 2021

Reds  place Jesse Winker on the injured list

August 17, 2021

Reds  designate Heath Hembree for assignment

August 24, 2021

Reds  designate Michael Feliz for assignment

Reds  designate Sean Doolittle for assignment

Reds  sign Tommy Milone

August 25, 2021

Reds  place Tejay Antone on the injured list

Reds  release Michael Feliz

August 31, 2021

Delino DeShields traded from Red Sox  to Reds 

September 12, 2021

Reds  designate Brad Brach for assignment

September 16, 2021

Reds  release Brad Brach

September 17, 2021

Reds  place Tyler Naquin on the injured list

September 18, 2021

Reds  place Jesse Winker on the injured list

Reds  place Shogo Akiyama on the injured list

September 20, 2021

Reds  place Tyler Stephenson on the injured list

September 22, 2021

Reds  place Tejay Antone on the injured list

Reds  place Mike Moustakas on the injured list

Reds  designate R.J. Alaniz for assignment

September 25, 2021

Reds  place Wade Miley on the injured list

October 11, 2021

Delino DeShields became a free agent

November 03, 2021

Tucker Barnhart traded from Reds  to Tigers 

Michael Lorenzen became a free agent

Mychal Givens became a free agent

November 04, 2021

Nick Castellanos became a free agent

November 18, 2021

Reds  sign Connor Overton

November 29, 2021

Reds  sign Aramis Garcia

December 01, 2021

Reds  sign Trey Amburgey

Reds  sign Andrew Knapp

December 09, 2021

Reds  sign Kyle Dowdy

December 20, 2021

Reds  sign Jake Bauers