- Across the board
- ADMC Program (Anti-Doping and Medication Control)
- Adverse Analytical Finding
- All Out
- Allowance Race
- Allowed To Settle
- Also-eligible
- Also-ran
- Altered Course
- Angled In
- Angled Out
- Apprentice
- As Rider Pleased
- Assumed Command
- Attempted To Wheel
- Away Alertly
- Backstretch
- Bandage
- Banned substances
- Bar shoe
- Best Stride Late
- Between Horses
- Beyer Speed Figure
- Bid, Hung
- Blanket finish