This is a list of some of the records relating to home runs hit in baseball games played in the Major Leagues.
Some Major League records are sufficiently notable to have their own page, for example the single-season home run record, the progression of the lifetime home run record, and the members of the 500 home run club.
A few other records are kept on separate pages, they are listed below.
In the tables below, players and teams denoted in boldface  are still actively contributing to the record noted, while (r) denotes a player's rookie season.
Career records
Most seasons with 40 home runs
Most consecutive seasons with 40 home runs
Most seasons with 30 home runs
Most consecutive seasons with 30 home runs
Most seasons with 20 home runs
Most consecutive seasons with 20 home runs
Most seasons as league leader in home runs
see note1 Most consecutive seasons as league leader in home runs
see note1 League leader in home runs, both leagues
League leader in home runs, three different teams
Players who have hit at least one home run in 40 stadiums
Most career grand slams
Most career [[walk-off home run]]s
Season records
Most home runs by a team in one season
Most grand slams by a player in one season
Game records
Four home runs by an individual in one game
Four consecutive home runs by a team in one game
Two grand slams by one hitter in one game
Three grand slams by a team in one game
Other
Most home runs on a single day (all teams combined)
Most walkoff home runs in a season (all teams combined)
See also
Home run
Grand slam
List of Major League Baseball progressive career home runs leaders
List of Major League Baseball career home run leaders
List of Major League Baseball all-time leaders in home runs by pitchers
List of Major League Baseball single-game grand slam leaders
500 home run club
20–20–20 club
30–30 club
The Year Babe Ruth Hit 104 Home Runs
Notes
Mark McGwire led the American League in home runs in 1987 and 1996.
He led the National League in 1998 and 1999.
In 1997, he led Major League Baseball in home runs, but led neither the American nor National League, as his season was split between the Oakland Athletics and St. Louis Cardinals.
If that season were to be included, he would be the league leader for five seasons, four of which were in succession.
Delahanty and Horner are the only players to hit four home runs in a game as a part of a losing effort.Baseball Almanac boxscoreRetrosheet box score, Expos at Braves July 6, 1986
Game 2 of a doubleheader.
Tony Cloninger is unique on this list as the only pitcher.
Fernando Tatís is the only player to hit his two grand slams in the same inning.
in the third inning off Chan Ho Park; it was also the Major League record for RBIs by a player in one inning (8).
Nomar Garciaparra is the only player to do so at home.
Bill Mueller is the only player to hit a grand slam from each side of the plate.
References
