The previous time these two teams met, the AFC title hung in the balance and Baltimore used a strong second half to pull out a 28-13 victory.
In this one, New England took a 17-0 lead early in the second quarter and never let up behind a defense that forced four turnovers and had four sacks.
"Happy to win the AFC East," Belichick said. "Hopefully, we can build off this game."
Tom Brady completed 14 of 26 passes for 172 yards and a touchdown. He has led his team to 11 division titles, two more than any other starting quarterback in NFL history.
"They're all special. It's hard to come by, and this team's really fought hard all year," Brady said. "We've earned it. Eleven wins in the NFL's not easy, and to win a division title's not easy."
"We got to go in there and win. That was going to be the case no matter what," said Harbaugh, who is in danger of missing the postseason for the first time in his six seasons with Baltimore.
Wearing a brace on his left knee after being injured last week in Detroit, Flacco had difficulty escaping the unyielding pressure applied by New England's defensive front.
"I don't think he played well," Harbaugh said.
Refusing to use the brace as an excuse, Flacco said, "I would have liked to play better. The brace had nothing to do with anything."
Baltimore trailed 20-0 late in the third quarter when Ray Rice was stuffed for no gain on a fourth-and-1 at the New England 4. That effectively ended any chance of a comeback.
The Ravens scored on a 1-yard quarterback sneak by Flacco with 9:21 left, enabling Baltimore to avoid its first shutout loss since 2002, against Tampa Bay.
It was of very little consolation to the defending champs.
Baltimore's previous three games were decided by three points or fewer, but it became evident early that this one would not be close.
New England went up 7-0 on its second possession. A 34-yard pass interference penalty against Jimmy Smith put the ball at the Baltimore 1 before Blount bulled into the end zone.
Shortly after halftime, the Ravens went for it on fourth-and-3 at the New England 39 and Flacco threw an incomplete pass.
Baltimore's next possession ended with Ryan's second interception of the game and fifth of the season. Seven plays later, Gostkowski kicked a 42-yard field goal.
Notes: New England DB Devin McCourty left with a head injury, and Vereen left with a groin injury. ... Tucker's miss was his first since Week 2. ... Baltimore finished with more yardage, 358-300.
Copyright 2013 by The Associated Press