| Date | May 7 | Total matches | 3 |
| Men's matches | 2 | Women's matches | 1 |
| Singles matches | 2 | Tag Team matches | 1 |
This episode of Ring of Honor 503 took place on May 7, 2021 and featured 3 matches on the card. All of the matches ended by pinfall, submission, or the rules stipulated by the match. No championships were defended on the card.
The matches featured 8 wrestlers and 2 tag teams, highlighted by Angelina Love, PCO, EC3, Flip Gordon and Quinn McKay.
| Women's Singles |
1-0 (Overall: 1-0, Last 5: 1-0) Win Probability: 50.0% |
0-1 (Overall: 0-1, Last 5: 0-1) Win Probability: 50.0% |
| Men's Singles |
1-0 (Overall: 1-0-1, Last 5: 1-0-1) Win Probability: 23.3% |
2-1 (Overall: 2-1, Last 5: 2-1) Win Probability: 76.7% |
| Men's Tag Team |
1-0 (Last 5: 1-0) Win Probability: 66.0% |
0-2 (Last 5: 0-2) Win Probability: 34.0% |