| Kevin Garnett (9) | Paul Pierce (4) | Madison Square Garden19,763 | 29–6 |- bgcolor="#ffcccc" | 36 | January 6 | @ Charlotte | | Paul Pierce (28) | Kevin Garnett (13) | Rajon Rondo (6) | Time Warner Cable Arena17,112 | 29–7 |- bgcolor="#ffcccc" | 37 | January 7 | Houston | | Paul Pierce (26) | Kevin Garnett (8) | Ray Allen (6) | TD Banknorth Garden18,624 | 29–8 |- bgcolor="#ffcccc" | 38 | January 9 | @ Cleveland | | Kevin Garnett (18) | Kevin Garnett (15) | Rajon Rondo (13) | Quicken Loans Arena20,562 | 29–9 |- bgcolor="#bbffbb" | 39 | January 11 | @ Toronto | | Ray Allen (36) | Kevin Garnett, Glen Davis (11) | Rajon Rondo (11) | Air Canada Centre19,800 | 30–9 |- bgcolor="#bbffbb" | 40 | January 12 | Toronto | | Paul Pierce (39) | Kevin Garnett (12) | Rajon Rondo (8) | TD Banknorth Garden18,624 | 31–9 |- bgcolor="#bbffbb" | 41 | January 14 | New Jersey | | Paul Pierce (22) | Kevin Garnett (9) | Rajon Rondo (12) | TD Banknorth Garden18,624 | 32–9 |- bgcolor="#bbffbb" | 42 | January 17 | @ New Jersey | | Ray Allen (25) | Kevin Garnett (10) | Rajon Rondo (14) | Izod Center17,578 | 33–9 |- bgcolor="#bbffbb" | 43 | January 19 | Phoenix | | Rajon Rondo (23) | Glen Davis (9) | Paul Pierce (8) | TD Banknorth Garden18,624 | 34–9 |- bgcolor="#bbffbb" | 44 | January 21 | @ Miami | | Ray Allen (27) | Kevin Garnett (13) | Rajon Rondo (10) | American Airlines Arena19,600 | 35–9 |- bgcolor="#bbffbb" | 45 | January 22 | @ Orlando | | Paul Pierce (27) | Paul Pierce (10) | Paul Pierce (4) | Amway Arena17,461 | 36–9 |- bgcolor="#bbffbb" | 46 | January 25 | Dallas | | Eddie House, Ray Allen, Kevin Garnett (23) | Rajon Rondo (7) | Rajon Rondo (14) | TD Banknorth Garden18,624 | 37–9 |- bgcolor="#bbffbb" | 47 | January 28 | Sacramento | | Eddie House (28) | Tony Allen, Kevin Garnett (8) | Rajon Rondo (9) | TD Banknorth Garden18,624 | 38–9 |- bgcolor="#bbffbb" | 48 | January 30 | @ Detroit | | Kevin Garnett (22) | Kevin Garnett (9) | Rajon Rondo (12) | The Palace of Auburn Hills22,076 | 39–9 |- bgcolor="#bbffbb" | 49