This is a list of missing biography articles for athletes who ranked in the top 25 of an individual event at the 1991 World Championships in Athletics. Compiled on 1 February 2020, 76 athletes were missing at creation. Athletes in bold finished in the top ten.
- 100 m
- 200 m
- 400 m
- 800 m
- 1500 m
- 3000 m
- 10,000 m
- 100 m hurdles
- 400 m hurdles
- 3000 m s'chase
- Marathon
- Tekeye Gebrselassie
- Sam Carey (athlete)
- Dave Buzza
- Vladimir Bukhanov
- Motsemme Kgaotsang
- Joy Smith (athlete)
- Yi-Lo Man
- Graciela Caizabanda
- 10 km walk
- 50 km walk
- High jump
- Pole vault
- Long jump
- Triple jump
- Shot put
- Discus throw
- Hammer throw
- Javelin throw
- Decathlon
- Heptathlon
This is a list of missing biography articles for athletes who ranked in the top 25 of an individual event at the 1991 World Championships in Athletics. Compiled on 1 February 2020, 76 athletes were missing at creation. Athletes in bold finished in the top ten.
- 100 m
- 200 m
- 400 m
- 800 m
- 1500 m
- 3000 m
- 10,000 m
- 100 m hurdles
- 400 m hurdles
- 3000 m s'chase
- Marathon
- Tekeye Gebrselassie
- Sam Carey (athlete)
- Dave Buzza
- Vladimir Bukhanov
- Motsemme Kgaotsang
- Joy Smith (athlete)
- Yi-Lo Man
- Graciela Caizabanda
- 10 km walk
- 50 km walk
- High jump
- Pole vault
- Long jump
- Triple jump
- Shot put
- Discus throw
- Hammer throw
- Javelin throw
- Decathlon
- Heptathlon