Hold onto your seat!

The number of riders bring thrown around on city buses is up this year, the MTA reported Monday — with officials blaming drivers swerving to avoid cars, bikes and pedestrians.

The number of “bus customer accidents” — reported mishaps that do not involve collisions — is up 11% through the end of August, from 442 in 2018 to 494, according to MTA data provided to The Post.

Of those, 207 — or 41.9% — were caused by “throwing movements,” a 5.5% jump from last year.

The MTA blames its drivers — and traffic.

“That seems to be mostly due to operators trying to avoid cars, pedestrians or bicyclists,” safety official Robert Diehl told MTA board members on Monday.

The agency has sought to address the issue by more closely monitoring driver behavior and through an information campaign targeting drivers at bus depots, where collisions and accidents have increased, Diehl said.

The second most common bus mishap — slips or falls that occur when riders board or exit the bus — is down slightly, from 163 to 160.

Reported collisions and collisions involving injuries have also increased this year, albeit slightly, by 1.2% and 1.8% respectively.