| Election Name: | 2008 Massachusetts Senate election |
| Country: | Massachusetts |
| Type: | legislative |
| Ongoing: | no |
| Previous Election: | 2006 Massachusetts Senate election |
| Previous Year: | 2006 |
| Next Election: | 2010 Massachusetts Senate election |
| Next Year: | 2010 |
| Seats For Election: | All 40 seats in the Massachusetts Senate |
| Majority Seats: | 21 |
| Election Date: | November 4, 2008 |
| Leader1: | Therese Murray |
| Party1: | Massachusetts Democratic Party |
| Leader Since1: | March 21, 2007 |
| Leaders Seat1: | Plymouth and Barnstable |
| Last Election1: | 35 seats |
| Seats1: | 35 |
| Leader2: | Richard Tisei |
| Party2: | Massachusetts Republican Party |
| Leader Since2: | January 3, 2007 |
| Leaders Seat2: | Middlesex and Essex |
| Last Election2: | 5 seats |
| Seats Needed2: | 14 |
| Seats2: | 5 |
| Map Size: | 350px |
| President | |
| Before Election: | Therese Murray |
| Before Party: | Massachusetts Democratic Party |
| After Election: | Therese Murray |
| After Party: | Massachusetts Democratic Party |
Elections to the 187th Massachusetts State Senate was held on November 4, 2008, the same date as the 2008 Massachusetts House election as well as Federal and Congressional elections. Massachusetts Senators serve two-year terms.