Haller scored his first goal since New Year's Day from a tight angle after beating Saints keeper Alex McCarthy in a challenge
West Ham's first Premier League win in two months was enough to take them out of the relegation zone as £20m Jarrod Bowen marked his full debut with a goal against Southampton.
Sebastian Haller and Michail Antonio were also on target at the London Stadium after teenage forward Michael Obafemi had levelled Bowen's opener for the Saints.
The excellent Antonio might have had another for the hosts after he had been sent free by an audacious rabona from Haller but goalkeeper Alex McCarthy made the save.
Unlike their last home game against Brighton, when they squandered a 3-1 lead, this time the Hammers eased home, moving above Aston Villa with a much-needed victory after a run of two points from their last seven games.
The result was also positive for co-chairman David Sullivan and David Gold given the protest against them that took place before the game by thousands of Hammers fans, angry at the way the club is being run.
More to follow.
- Reaction to West Ham's win and follow Watford v Liverpool
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Line-ups
Match Stats
Live Text
Line-ups
West Ham
1Fabianski
52Ngakia
23Diop
21Ogbonna
3CresswellBooked at 65mins
16Noble
41Rice
17BowenSubstituted forSnodgrassat 78'minutes
18FornalsSubstituted forFelipe Andersonat 90+2'minutes
30Antonio
22Haller
Substitutes
4Balbuena
5Zabaleta
8Felipe Anderson
10Lanzini
11Snodgrass
26Masuaku
35Randolph
Southampton
1McCarthy
16Ward-Prowse
5StephensBooked at 45mins
35Bednarek
21Bertrand
17Armstrong
27SmallboneSubstituted forRomeuat 78'minutes
23Højbjerg
19BoufalSubstituted forIngsat 54'minutes
7Long
20ObafemiSubstituted forVestergaardat 68'minutes
Substitutes
4Vestergaard
9Ings
10Adams
14Romeu
24Walker-Peters
28Gunn
43Valery
Referee:
Anthony Taylor
Attendance:
59,962
Match Stats
Home TeamWest HamAway TeamSouthampton
Possession
Home34%
Away66%
Shots
Home14
Away10
Shots on Target
Home7
Away2
Corners
Home4
Away9
Fouls
Home8
Away11
Live Text
Posted at
Match ends, West Ham United 3, Southampton 1.
Full TimePosted at 90'+4'
Second Half ends, West Ham United 3, Southampton 1.
Posted at 90'+3'
Corner, Southampton. Conceded by Issa Diop.
Posted at 90'+3'
Shane Long (Southampton) wins a free kick in the attacking half.
Posted at 90'+3'
Foul by Felipe Anderson (West Ham United).
SubstitutionPosted at 90'+2'
Substitution, West Ham United. Felipe Anderson replaces Pablo Fornals.
Posted at 88'
Corner, Southampton. Conceded by Robert Snodgrass.
Posted at 86'
Hand ball by Jan Bednarek (Southampton).
Posted at 86'
Corner, Southampton. Conceded by Angelo Ogbonna.
Posted at 86'
Attempt blocked. Danny Ings (Southampton) right footed shot from the right side of the box is blocked. Assisted by James Ward-Prowse.
Posted at 80'
Foul by Danny Ings (Southampton).
Posted at 80'
Sébastien Haller (West Ham United) wins a free kick in the attacking half.
Posted at 78'
Hand ball by Michail Antonio (West Ham United).
SubstitutionPosted at 78'
Substitution, Southampton. Oriol Romeu replaces William Smallbone.
SubstitutionPosted at 78'
Substitution, West Ham United. Robert Snodgrass replaces Jarrod Bowen.
Posted at 77'
Attempt missed. Stuart Armstrong (Southampton) right footed shot from outside the box is high and wide to the right following a corner.
Posted at 77'
Attempt blocked. Pierre-Emile Højbjerg (Southampton) header from the centre of the box is blocked. Assisted by Ryan Bertrand.
Posted at 76'
Corner, Southampton. Conceded by Angelo Ogbonna.
Posted at 75'
James Ward-Prowse (Southampton) wins a free kick in the defensive half.
Posted at 75'
Foul by Mark Noble (West Ham United).
Posted at 72'
Attempt missed. Jarrod Bowen (West Ham United) left footed shot from outside the box is high and wide to the left following a fast break.
Posted at 69'
Attempt missed. Pablo Fornals (West Ham United) right footed shot from outside the box misses to the right. Assisted by Michail Antonio.
Posted at 69'
Offside, Southampton. Jan Bednarek tries a through ball, but Shane Long is caught offside.
SubstitutionPosted at 68'
Substitution, Southampton. Jannik Vestergaard replaces Michael Obafemi.
Posted at 68'
Attempt missed. Angelo Ogbonna (West Ham United) left footed shot from the centre of the box misses to the left. Assisted by Jarrod Bowen with a cross following a corner.
Posted at 67'
Corner, West Ham United. Conceded by Shane Long.
Posted at 66'
Foul by Jan Bednarek (Southampton).
Posted at 66'
Sébastien Haller (West Ham United) wins a free kick in the attacking half.
Posted at 66'
Stuart Armstrong (Southampton) wins a free kick on the left wing.
Posted at 66'
Foul by Jarrod Bowen (West Ham United).
Posted at 65'
Attempt saved. Ryan Bertrand (Southampton) left footed shot from outside the box is saved in the bottom right corner.
BookingPosted at 65'
Aaron Cresswell (West Ham United) is shown the yellow card for a bad foul.
Posted at 64'
Shane Long (Southampton) wins a free kick on the right wing.
Posted at 64'
Foul by Aaron Cresswell (West Ham United).
Posted at 64'
VAR Decision: No Penalty West Ham United.
Posted at 63'
Attempt missed. Sébastien Haller (West Ham United) header from the centre of the box misses to the right.
Posted at 62'
Hand ball by Danny Ings (Southampton).
Posted at 61'
Corner, West Ham United. Conceded by Alex McCarthy.
Posted at 61'
Attempt saved. Michail Antonio (West Ham United) right footed shot from the centre of the box is saved in the bottom right corner. Assisted by Sébastien Haller.
Goal!Posted at 54'
Goal! West Ham United 3, Southampton 1. Michail Antonio (West Ham United) right footed shot from the centre of the box to the bottom right corner. Assisted by Pablo Fornals.
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Source: bbc.com