| Competition: | Primera División de México |
| Season: | 2002−03 |
| Winners: | Toluca (7th title) |
| Continentalcup1: | Champions' Cup |
| Continentalcup1 Qualifiers: | Toluca Morelia |
| Continentalcup2: | Copa Libertadores |
| Continentalcup2 Qualifiers: | UNAM Cruz Azul |
| League Topscorer: | José Cardozo (29 goals) |
| Prevseason: | Verano 2002 |
| Nextseason: | Clausura 2003 |
Primera División de México (Mexican First Division) Apertura 2002 is a Mexican football tournament - one of two short tournaments that take up the entire year to determine the champion(s) of Mexican football. It began on Saturday, August 3, 2002, and ran until November 24, when the regular season ended. San Luis, Chiapas and Querétaro were promoted to the Primera División de México thus, Léon and La Piedad were relegated to the Primera División A, allowing 20 teams to compete in the Mexican First Division. On December 21, Toluca defeated Morelia and became champions for the seventh time.
| Team | Manager | Captain | Kit manufacturer | Shirt sponsor | |
|---|---|---|---|---|---|
| América |  Mario Carrillo | Pável Pardo | Nike | Coca-Cola | |
| Atlante | Miguel Herrera |  Damián Grosso | Garcis | Pegaso | |
| Atlas | Enrique Meza | Nike | Coca-Cola/Omnilife | ||
| Celaya |  Carlos Trucco | Keuka | Lala | ||
| Chiapas | Salvador Capitano | Sergio Almaguer | Atletica | Farmacias del Ahorro | |
| Cruz Azul | José Luis Trejo | Óscar Pérez | Umbro | Cemento Cruz Azul | |
| Guadalajara | Daniel Guzmán | Atletica | Cemento Tolteca | ||
| Monterrey | Daniel Passarella | Jesús Arellano | Atletica | Bimbo | |
| Morelia | Rubén Omar Romano | Darío Franco | Atletica | LG | |
| Necaxa | Raúl Arias | Atletica | Bimbo | ||
| Pachuca | Alfredo Tena | Atletica | Cemento Cruz Azul | ||
| Puebla | Gustavo Vargas | Atletica | Volkswagen | ||
| Querétaro | Mario Zanabria | Marval | Kellogg's | ||
| San Luis | Juan Antonio Luna | Atletica | Bimbo | ||
| Santos Laguna | Sergio Bueno | Jared Borgetti | Atletica | Soriana | |
| Toluca | Ricardo La Volpe | Salvador Carmona | Atletica | Banamex | |
| UAG |  Julio César Uribe | Atletica | Ocho Columnas | ||
| UANL |  Ricardo Ferretti | Atletica | Cemento Monterrey | ||
| UNAM | Hugo Sánchez | Lotto | Banamex | ||
| Veracruz | Hugo Fernández | Spalding | Gigante |
Players sorted first by goals scored, then by last name. Only regular season goals listed.
| Rank | Player | Club | Goals | ||
|---|---|---|---|---|---|
| align=center rowspan=1 | 1 | José Cardozo | Toluca | align=center rowspan=1 | 29 |
| align=center rowspan=3 | 2 | Jared Borgetti | Santos Laguna | align=center rowspan=3 | 13 |
| Sebastián González | Atlante | ||||
| Alex Fernandes | Morelia | ||||
| align=center rowspan=1 | 5 | Marcelo de Faria | San Luis | align=center rowspan=1 | 12 |
| align=center rowspan=1 | 6 | Jesús Olalde | UNAM | align=center rowspan=1 | 10 |
| align=center rowspan=1 | 7 | Reinaldo Navia | UAG | align=center rowspan=1 | 9 |
| align=center rowspan=4 | 8 | Cuauhtémoc Blanco | América | align=center rowspan=4 | 8 |
| Diego Latorre | Celaya | ||||
| Josemir Lujambio | Querétaro | ||||
| Mariano Trujillo | UNAM |
Source: MedioTiempo
Toluca won 4–2 on aggregate.----
Santos Laguna won 5–4 on aggregate.----
UNAM won 3–2 on aggregate.----
Morelia won 7–2 on aggregate.
Toluca won 7–4 on aggregate.----
Morelia won 5–2 on aggregate.
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Toluca won 4–2 on aggregate.
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