'''Tim''' or '''Timothy O'Brien''' may refer to:
{{tocright}} ==Arts and entertainment== * Tim O'Brien (record producer), American record producer and music industry executive. * Tim O'Brien (author) (born 1946), American novelist * Tim O'Brien (illustrator) (born 1964), American artist * Tim O'Brien (musician) (born 1954), American country and bluegrass singer * Timothy O'Brien (theatre designer) (1929–2022), British theatre designer
==Sports== * Sir Tim O'Brien, 3rd Baronet (1861–1948), Irish-born cricketer * Tim O'Brien (footballer) (born 1994), Australian rules footballer * Tim O'Brien (rugby union), head coach of St. Mary's Gaels rugby
==Other== * Sir Timothy O'Brien, 1st Baronet (1787–1862), Irish politician and merchant * Tim O'Brien (physicist) (born 1963), astrophysicist at the University of Manchester * Tim O'Brien (Connecticut politician) (born 1968), legislator in the Connecticut House of Representatives * Tim O'Brien (Indiana politician), member of the Indiana House of Representatives * Timothy O'Brien (endocrinologist), Irish professor * Timothy L. O'Brien (born 1961), American journalist
==See also== * Timothy (given name) * O'Brien (disambiguation)
{{Hndis|Obrien, Tim}}