ongoing monthly titles

Flash Comics [1940-1949, 104 issues]
Flash [1959-1985, 246 issues]
Flash [1987-current]
Impulse [1995-2002, 89 issues]

miniseries

Flash & Green Lantern: Brave & Bold [Brave & Bold 6 issues, 1999]
Flash / Green Lantern: Faster Friends [2 issues, 1999]
Flash: The Fastest Man Alive [Flash 1-13, 2006]
Final Crisis: Rogues' Revenge [3 issues, 2008]

original graphic novels, one-shots, and specials

Life Story of the Flash
Flash Special (1990)
DC Comics Presents: The Flash
DC 1st: Flash / Superman
Flash 1,000,000
Flash: Our Worlds at War
Flash + Nightwing
Flash 80 Page Giant 1
Flash 80 Page Giant 2
Flash: Iron Heights
Flash: Secret Files & Origins 1
Flash: Secret Files & Origins 2
Flash: Secret Files & Origins 3
Impulse / Atom Doubleshot
Impulse 1,000,000
Impulse + Gross Out
Sins of Youth: Kid Flash / Impulse

trade paperbacks and collected editions

Flash: Born to Run [Flash 62-65, Annual 8; Speed Force 1; 80 Page Giant 1]
Flash: The Return of Barry Allen [Flash 74-79]
Impulse: Reckless Youth [Flash 92-94; Impulse 1-6]
Flash: Terminal Velocity [Flash 0, 95-100]
Flash: Dead Heat [108-111; Impulse 9-11]
Flash: Race Against Time [flash 112-118]
Flash: Wonderland [Flash 164-169]
Flash: Blood Will Run [Flash 170-176 (some printings include Iron Heights)]
Flash: The Rogues [Flash 177-182]
Flash: Crossfire [Flash 183-191]
Flash: Blitz [Flash 192-200]
Flash: Ignition [flash 201-206]
Flash: The Secret of Barry Allen [Flash 207-211, 213-217]
Flash: Rogue War [Flash 1/2, 212, 218-225]
Flash: Lightning in a Bottle [Flash: Fastest Man Alive 1-6]
Flash: Full Throttle [Flash: Fastest Man Alive 7-13]
Flash: The Wild Wests [Flash 231-237]
Flash: Countdown Special []
Flash: The Greatest Stories Ever Told [etc. stories - varies with each printing]
Flash / Green Lantern: The Brave & the Bold [Brave & Bold 1-6]

see also

Justice Society
Justice League
Titans