| 53rd Congress (LIII Legislatura) | |
| Before: | 52nd |
| After: | 54th |
| Chamber1: | Senate |
| Membership1: | 64 senators |
| Chamber1 Leader1 Type: | President |
| Chamber2: | Chamber of Deputies |
| Membership2: | 400 deputies |
| Chamber2 Leader1 Type: | President |
The LIII Legislature of the Congress of the Union of Mexico (53rd Congress) was made up of senators and deputies members of their respective chambers. They began duties on 1 September 1985 and ended on 31 August 1988.
The senators of this legislature were elected in the 1982 election and also exercised their positions in the previous session of Congress. The deputies were elected in the 1985 election.
| Match | Deputies Relative majority | Deputies Proportional Rep. | Total | ||
|---|---|---|---|---|---|
| National Action Party | 9 | 32 | 41 | ||
| Authentic Party of the Mexican Revolution | 2 | 9 | 11 | ||
| Mexican Democratic Party | 0 | 12 | 12 | ||
| Mexican Workers Party | 0 | 6 | 6 | ||
| Socialist People's Party | 0 | 11 | 11 | ||
| Institutional Revolutionary Party | 289 | 0 | 289 | ||
| Workers' Revolutionary Party | 0 | 6 | 6 | ||
| Socialist Workers Party | 0 | 12 | 12 | ||
| Unified Socialist Party of Mexico | 0 | 6 | 6 | ||
| Total | 300 | 100 | 400 | ||
| Source: . | |||||