Elections to the Baseball Hall of Fame for 2008 proceeded according to revised rules enacted in 2001 and further revamped in 2007. The Baseball Writers' Association of America (BBWAA) held an election to select from among recent players. A restructured format for Veterans Committee voting resulted in the first successful election by that body since 2001, with five candidates earning induction, after the three elections in the intervening years failed to produce any inductees. Initially, the Veterans Committee was not scheduled to hold an election; the 2001 rules changes provided that elections for players retired over 20 years would be held every other year, with elections of non-players (managers, umpires and executives) held every fourth year. The Committee voted in 2007 in both areas, and an election for players was next held in 2009. Under the 2001 rules, the next election for non-players would have been conducted in 2011; however, the 2007 changes meant that elections of non-players would now be conducted for inductions in even-numbered years beginning in 2008, with managers and umpires elected from one ballot and executives from a separate ballot.
Induction ceremonies in Cooperstown were held July 27 with Commissioner Bud Selig presiding.
The BBWAA was again authorized to elect players active in 1988 or later, but not after 2002; the ballot, announced on November 26, 2007, included candidates from the 2007 ballot who received at least 5% of the vote but were not elected, along with selected players, chosen by a screening committee, whose last appearance was in 2002. All 10-year members of the BBWAA were eligible to vote.
Voters were instructed to cast votes for up to 10 candidates; any candidate who received votes on at least 75% of the ballots would be honored with induction to the Hall. Results of the 2008 election by the BBWAA were announced on January 8. The ballot consisted of 25 players, and over 575 ballots were distributed; they had to be returned by December 31, and votes were tabulated by BBWAA official Jack O'Connell along with Michael DiLecce, a partner in the Ernst & Young accounting firm. 543 ballots were cast (including 3 ballots which supported no candidates), two short of the record total of 2007, with 408 votes required for election. A total of 2,907 individual votes were cast, an average of 5.35 per ballot. Those candidates who received less than 5% of the vote will not appear on future BBWAA ballots, but may eventually be considered by the Veterans Committee.