They trailed at the break before goals from Joel Randall and Josh Knight wrapped up another win.
It opens up a slender two point gap on chasing Derby County.
Here David Lowndes captured these pictures of just some of the Posh fans in the crowd. Take a look and see who you know.
Get the latest Posh news here.
1. Posh 2 Shrewsbury 1
Peterborough United fans take in the win over Shrewsbury Town. Photo: David Lowndes
2. Posh 2 Shrewsbury 1
Peterborough United fans take in the win over Shrewsbury Town. Photo: David Lowndes
3. Posh 2 Shrewsbury 1
Peterborough United fans take in the win over Shrewsbury Town. Photo: David Lowndes
4. Posh 2 Shrewsbury 1
Peterborough United fans take in the win over Shrewsbury Town. Photo: David Lowndes