| election_name = 2008 United States Senate elections
| country = United States
| type = legislative
| ongoing = no
| previous_election = 2006 United States Senate elections
| previous_year = 2006
| next_election = 2010 United States Senate elections
| next_year = 2010
| seats_for_election = 35 of the 100 seats in the United States Senate
| majority_seats = 51
| election_date = November 4, 2008
December 2 (Georgia runoff)
| image_size = 160x180px
| 1blank = Seats up
| 2blank = Races won
| party1 = Democratic Party (US)
| image1 = Harry Reid official portrait 2009 (3x4b).jpg
| leader1 = Harry Reid
| leaders_seat1 = Nevada
| seats_before1 = 49
| seats_after1 = 57
| seat_change1 = 
8
| popular_vote1 = 33,650,061[1][a]
| percentage1 = 51.88%
| 1data1 = 12
| 2data1 = 20
| party2 = Republican Party (US)
| image2 = Sen Mitch McConnell official (3x4a).jpg
| leader2 = Mitch McConnell
| leaders_seat2 = Kentucky
| seats_before2 = 49
| seats_after2 = 41
| seat_change2 = 
8
| popular_vote2 = 28,863,067[1][a]
| percentage2 = 44.5%
| 1data2 = 23
| 2data2 = 15
| party4 = Independent (US)
| seats_before4 = 2[b]
| seats_after4 = 2
| seat_change4 = 
| popular_vote4 = 176,752[1]
| percentage4 = 0.27%
| 1data4 = 0
| 2data4 = 0
| map_image =
| map_size = 320px
| map_caption = Results of the elections:
Democratic hold Democratic gain
Republican hold
No election
Rectangular inset (Miss. & Wyo.): both seats up for election
| title = Majority Leader | before_election = Harry Reid | before_party = Democratic Party (US) | after_election = Harry Reid | after_party = Democratic Party (US) }}
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