The 1956–57 Serie C was the nineteenth edition of Serie C, the third highest league in the Italian football league system.

There were only three relegations because of the reform of the IV Serie.

Final classification

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Pos Team Pld W D L GF GA GD Pts Promotion or relegation
1 Prato 34 19 10 5 50 20 +30 48 Promoted to Serie B
2 Lecco 34 16 13 5 43 23 +20 45
3 Salernitana 34 18 8 8 47 27 +20 44
4 Reggiana 34 14 10 10 39 31 +8 38
5 Cremonese 34 14 9 11 38 37 +1 37
6 Mestre 34 11 14 9 47 44 +3 36
7 Biellese 34 12 10 12 43 47 −4 34
8 Pavia[a] 34 11 11 12 34 39 −5 33 Relegated
9 Reggina 34 12 8 14 33 29 +4 32
10 Siena 34 11 10 13 40 42 −2 32
11 Carbosarda 34 13 6 15 46 49 −3 32
12 Livorno 34 11 9 14 36 36 0 31
13 Sanremese 34 11 9 14 38 44 −6 31
14 Catanzaro 34 11 9 14 22 29 −7 31
15 Vigevano 34 12 7 15 45 55 −10 31
16 Siracusa[b] 34 9 11 14 28 43 −15 29
17 Treviso 34 8 10 16 33 49 −16 26 Relegated to IV Serie
18 Molfetta 34 8 6 20 35 53 −18 22
Source: [citation needed]
Notes:
  1. ^ The club went bankrupt on September 11, 1957. It was relegated to the regional leagues.
  2. ^ Relegated and later readmitted in place of A.C. Pavia.