The NFL scored its biggest TV audience of the season in the Pittsburgh Steelers’ controversial loss to the New England Patriots on Sunday night — but it wasn’t enough to reverse overall viewership declines.

The disappointing TV audience for Week 15’s eight games, including two on Saturday, left the NFL’s average TV viewership 9 percent below last season’s total for the same period, according to Nielsen.

After Week 14, viewership was 8.4 percent behind last season.

Each of the NFL’s 96 national telecasts this season has averaged 15.1 million viewers, compared with 16.6 million for the 95 telecasts through Week 15 of last year.

All told, viewership of all NFL telecasts this year has dropped by 130 million.

The CBS season-leading broadcast of the Pittsburgh-New England contest attracted 26.9 million viewers, an 8 percent increase over last year’s comparable game.

The only other match-up to post a gain was NFL Network’s telecast of the Kansas City Chiefs’ 30-14 win over the Los Angeles Chargers. Yet its bump of 59 percent took viewership to a mere 7 million.

That’s better than the 4.4 million drawn to the Miami Dolphins’ rout of the New York Jets in the same slot a season ago, but it barely moved the needle.

“Thursday Night Football” was the week’s biggest loser, down 40 percent, despite being telecast on NBC and NFL Network — as well as streamed by Amazon.

The 10.9 million viewers drawn to the tri-cast, pitting two second-division teams, was a season low for “TNF.”

NBC’s “Sunday Night Football” and ESPN’s “Monday Night Football” also posted double-digit declines.

On “SNF,” the Dallas Cowboys’ win over the Oakland Raiders drew a respectable 19.2 million viewers — but it was down 26 percent from last year.

On “MNF,” the Atlanta Falcons beat the Buccaneers in a game won by a field goal. Yet viewership was down 16 percent from 2016’s Carolina Panthers-Washington Redskins game.