Ireland at the 2000 Summer Olympics

• Sonia O'Sullivan – Athletics, Women's 5000m

Men's 100m

• Paul Brizzell

• Round 1 – 10.62 (→ did not advance)

Men's 200m

• Paul Brizzell

• Round 1 – 20.98 (→ did not advance)

Men's 400m

• Tomas Coman

• Round 1 – 46.17 (→ did not advance)

Men's 800m

• David Matthews

• Round 1 – 01:48.77 (→ did not advance)

Men's 1,500m

• James Nolan

• Round 1 – 03:40.50 (→ did not advance)

Men's 5,000m

• Mark Carroll

• Round 1 – 13:30.60 (→ did not advance)

Men's 110m Hurdles

• Peter Coghlan

• Round 1 – 14.03
• Round 2 – 13.86 (→ did not advance)

Men's 400m Hurdles

• Tom McGuirk

• Round 1 – 51.73 (→ did not advance)

Men's 4 × 100 m

• Paul Brizzell, Tom Comyns, John McAdorey, Gary Ryan

• Round 1 – 39.26 (→ did not advance)

Men's 4 × 400 m

• Tomas Coman, Robert Daly, Paul "Junior" McKee, Paul Oppermann

• Round 1 – 03:07.42 (→ did not advance)

Men's High Jump

• Brendan Reilly

• Qualifying – 2.20 (→ did not advance)

Men's Discus

• Nick Sweeney

• Qualifying – 57.37 (→ did not advance)

• John Menton

• Qualifying – 54.21 (→ did not advance)

Men's Javelin Throw

• Terry McHugh

• Qualifying – 79.90 (→ did not advance)

Men's Hammer Throw

• Paddy McGrath

• Qualifying – 67.00 (→ did not advance)

Men's 20 km Walk

• Robert Heffernan

• Final – 1:26:04 (→ 28th place)

Men's 50 km Walk

• Jamie Costin

• Final – 4:24:22 (→ 38th place)

Women's 100m

• Sarah Reilly

• Round 1 – 11.56
• Round 2 – 11.53 (→ did not advance)

Women's 200m

• Sarah Reilly

• Round 1 – 23.43 (→ did not advance)

Women's 400m

• Karen Shinkins

• Round 1 – 53.27 (→ did not advance)

Women's 1,500m

• Sinead Delahunty

• Round 1 – 04:11.75 (→ did not advance)

Women's 5,000m

• Sonia O'Sullivan

• Round 1 – 15:07.91
• Final – 14:41.02 (→ Silver Medal)

• Rosemary Ryan

• Round 1 – 15:33.05 (→ did not advance)

• Breda Dennehy-Willis

• Round 1 – 15:49.58 (→ did not advance)

Women's 10,000m

• Sonia O'Sullivan

• Round 1 – 32:29.93
• Final – 30:53.37 (→ 6th place)

• Breda Dennehy-Willis

• Round 1 – 33:17.45 (→ did not advance)

Women's 400m Hurdles

• Susan Smith-Walsh

• Round 1 – 57.08 (→ did not advance)

Women's 4 × 400 m

• Emily Maher, Martina McCarthy, Ciara Sheehy, Karen Shinkins

• Round 1 – 03:32.24 (→ did not advance)

Women's 20 km Walk

• Gillian O'Sullivan

• Final – 1:33:10 (→ 10th place)

• Olive Loughnane

• Final – 1:38:23 (→ 35th place)

Women's Singles

• Sonya McGinn

• Round of 64: Bye
• Round of 32: Lost to Mia Audina Tjiptawan of Netherlands (→ did not advance)

Men's 71 kg

• Michael Roche

• Round 1 – Lost to Firat Karagollu of Turkey (→ did not advance)

Men's Kayak Singles 500m

• Gary Mawer

• Qualifying Heat – 01:49.705 (→ did not advance)

Men's Kayak Singles 1000m

• Gary Mawer

• Qualifying Heat – 03:45.787
• Semifinal – 03:50.363 (→ did not advance)

Men's Kayak Singles

• Ian Wiley

• Qualifying – 266.42 (→ did not advance)

Women's Kayak Singles

• Eadaoin Ní Challarain

• Qualifying – 331.49 (→ did not advance)

Men's Cross Country Mountain Bike

• Robin Seymour

• Final – 2:20:40.19 (→ 28th place)

Women's Cross Country Mountain Bike

• Tarja Owens

• Final – Lapped (→ 29th place)

Men's Road Race

• David McCann

• Final – 5:30:46 (→ 43rd place)

• Ciarán Power

• Final – 5:34:58 (→ 74th place)

Women's Road Race

• Deirdre Murphy

• Final – DNF (→ no ranking)

Men's Lightweight Fours

• Neville Maxwell 5th in the B final (→ 11th)
• Neal Byrne 5th in the B final (→ 11th)
• Gearoid Towey 5th in the B final (→ 11th)
• Tony O'Connor 5th in the B final (→ 11th)

Men's Single Handed Dinghy (Finn)

• David Burrows

• Race 1 – 9
• Race 2 – (16)
• Race 3 – 7
• Race 4 – 15
• Race 5 – (19)
• Race 6 – 1
• Race 7 – 10
• Race 8 – 1
• Race 9 – 6
• Race 10 – 12
• Race 11 – 8
• Final – 69 (→ 9th place)

Men's Two Handed Keelboat (Star)

• Mark Mansfield and David O'Brien

• Race 1 – (15)
• Race 2 – 12
• Race 3 – 12
• Race 4 – 10
• Race 5 – 7
• Race 6 – 9
• Race 7 – 13
• Race 8 – 3
• Race 9 – 11
• Race 10 – 13
• Race 11 – (17) OCS
• Final – 90 (→ 14th place)

Women's Single Handed Dinghy (Europe)

• Maria Coleman

• Race 1 – 11
• Race 2 – 5
• Race 3 – 3
• Race 4 – 15
• Race 5 – (17)
• Race 6 – 7
• Race 7 – 11
• Race 8 – (17)
• Race 9 – 9
• Race 10 – 14
• Race 11 – 11
• Final – 86 (→ 12th place)

Men's 200m Butterfly

• Colin Lowth

• Preliminary Heat – 02:03.91 (→ did not advance)

Men's 100m Breaststroke

• Andrew Bree

• Preliminary Heat – 01:04.58 (→ did not advance)

Men's 200m Breaststroke

• Andrew Bree

• Preliminary Heat – 02:18.14 (→ did not advance)

Women's 50m Freestyle

• Chantal Gibney

• Preliminary Heat – 27.46 (→ did not advance)

Women's 100m Freestyle

• Chantal Gibney

• Preliminary Heat – 58.79 (→ did not advance)

Women's 200m Freestyle

• Chantal Gibney

• Preliminary Heat – 02:05.24 (→ did not advance)

Women's 400m Freestyle

• Chantal Gibney

• Preliminary Heat – 04:23.73 (→ did not advance)

Women's 100m Breaststroke

• Emma Robinson

• Preliminary Heat – 01:13.41 (→ did not advance)