Aaron O'Brien

{{Use dmy dates|date=January 2022}}

{{Use Australian English|date=September 2012}}

{{Infobox cricketer

| name = Aaron O'Brien

| image =

| country = Australia

| fullname = Aaron Warren O'Brien

| birth_date = {{Birth date and age|1981|10|2|df=yes}}

| birth_place = St Leonards, New South Wales, Australia

| heightm = 1.82

| batting = Left-handed

| bowling = Slow left-arm orthodox

| role = All-rounder

| club1 = New South Wales

| year1 = {{nowrap|2001/02–2006/07}}

| club2 = South Australia

| year2 = 2008/09–2011/12

| club3 = Adelaide Strikers

| year3 = 2011/12

| club4 = Melbourne Renegades

| year4 = 2012/13–2013/14

| type1 = FC

| debutdate1 = 14 December

| debutyear1 = 2001

| debutfor1 = New South Wales

| debutagainst1 = Western Australia

| lastdate1 =

| lastyear1 =

| lastfor1 =

| lastagainst1 =

| type2 = LA

| debutdate2 = 6 January

| debutyear2 = 2002

| debutfor2 = New South Wales

| debutagainst2 = Victoria

| lastdate2 =

| lastyear2 =

| lastfor2 =

| lastagainst2 =

| columns = 3

| column1 = FC

| matches1 = 49

| runs1 = 1,846

| bat avg1 = 26.75

| 100s/50s1 = 1/8

| top score1 = 147

| deliveries1 = 5,619

| wickets1 = 51

| bowl avg1 = 56.11

| fivefor1 = 0

| tenfor1 = 0

| best bowling1 = 4/74

| catches/stumpings1 = 27/–

| column2 = LA

| matches2 = 64

| runs2 = 1,147

| bat avg2 = 31.00

| 100s/50s2 = 0/6

| top score2 = 62*

| deliveries2 = 2,395

| wickets2 = 40

| bowl avg2 = 48.85

| fivefor2 = 0

| tenfor2 = 0

| best bowling2 = 4/41

| catches/stumpings2 = 20/–

| column3 = T20

| matches3 = 58

| runs3 = 255

| bat avg3 = 15.93

| 100s/50s3 = 0/0

| top score3 = 38

| deliveries3 = 1,161

| wickets3 = 55

| bowl avg3 = 25.95

| fivefor3 = 0

| tenfor3 = 0

| best bowling3 = 3/15

| catches/stumpings3 = 22/–

| date = 21 May

| year = 2023

| source = https://cricketarchive.com/Players/9/9915/9915.html CricketArchive

}}

Aaron Warren O'Brien (born 2 October 1981) is an Australian cricketer. He has played first class cricket for New South Wales. He was Middleton Cricket Club's professional deputising for the injured Brendon Reddy for the match against Crompton.{{Cite web|url=http://www.middletoncc.co.uk/index.php?option=com_wrapper&Itemid=32|title = Middleton Cricket Club | Members of the JW Lees Lancashire League}}

O'Brien signed with South Australia for the 2008–2009 domestic season, to get regular playing opportunities.