| Medal record | ||
|---|---|---|
| Men's rowing | ||
Representing  Ireland | ||
| World Rowing Championships | ||
 | 1991 Vienna | LM1x |
 | 1994 Indianapolis | LM1x |
Niall O'Toole (born 26 March 1970 in Dublin) is an Irish rower with Commercial Rowing Club. He competed in three Olympics:
- Barcelona 1992 – Men's Single Scull – 21st
- Atlanta 1996 – Men's Double Sculls – 3rd in Repechage
- Athens 2004 – Men's Lightweight Four – 6th
He won the Men's World Lightweight Single Sculls Championship in 1991 in Vienna and took a silver medal in the same event on Indianapolis in 1994.
