The 1998 Britannic Assurance County Championship was the 99th officially organised running of the County Championship. Leicestershire won the title, and were the first undefeated Champion since Hampshire in 1973.
May 23–24: Northamptonshire's second innings total of 712 against Glamorgan at Northampton was the highest second-innings total in English first-class cricket, surpassing Cambridge University's 703 for 9 against Sussex in 1890.
Malachy Loye's 322 during this innings was the highest innings played by any batsman during a second innings in English first-class cricket, surpassing Emrys Davies' 287 for Glamorgan against Gloucestershire in 1939.
June 21: Andrew Flintoff of Lancashire takes 38 runs off an over by Surrey's Alex Tudor, breaking the English first-class record of 36 by Garfield Sobers from 1968.
Notes
12Glamorgan finished ahead of Worcestershire by virtue of having taken more wickets over the whole season.
↑Northamptonshire lost 25 points for preparing a pitch deemed unsuitable for first-class cricket