The 1998 San Diego State Aztecs football team represented San Diego State University during the 1998 NCAA Division I-A football season as a member of the Western Athletic Conference (WAC). This was the last season for the Aztecs in the WAC, as they became a charter member of the Mountain West Conference in the 1999 season.

The team was led by head coach Ted Tollner, in his fifth year. They played home games at Qualcomm Stadium^{[note 1]} in San Diego. They completed the season as co-champions of the Pacific Division of the WAC, with a record of seven wins, five losses (7–5, 7–1 WAC). The Aztecs qualified for a bowl game at the end of the 1998 season, and played the North Carolina Tar Heels in the 1998 Las Vegas Bowl in Las Vegas, Nevada.

More information Date, Opponent ...

Date	Opponent	Site	TV	Result	Attendance
September 5	No. 20 Wisconsin*	Qualcomm Stadium San Diego, CA	Cox 4	L 14–26	37,471
September 12	at No. 22 USC*	Los Angeles Memorial Coliseum Los Angeles, CA	Fox West 2	L 6–35	49,927
September 24	No. 16 Arizona*	Qualcomm Stadium San Diego, CA	ESPN	L 16–35	23,811
October 3	at Tulsa	Skelly Stadium Tulsa, OK		W 24–14	18,320
October 9	Hawaii	Qualcomm Stadium San Diego, CA	Cox 4	W 35–13	20,320
October 17	at New Mexico	University Stadium Albuquerque, NM	Cox 4	W 36–33 OT	26,187
October 24	Utah	Qualcomm Stadium San Diego, CA	Cox 4	W 21–20 OT	28,807
October 29	at BYU	Cougar Stadium Provo, UT	ESPN	L 0–13	63,496
November 7	Fresno State	Qualcomm Stadium San Diego, CA (rivalry)	ABC	W 10–0	22,497
November 14	at San Jose State	Spartan Stadium San Jose, CA	Cox 4	W 34–6	12,833
November 21	UTEP	Qualcomm Stadium San Diego, CA	Cox 4	W 34–29	22,365
December 19	vs. North Carolina*	Sam Boyd Stadium Whitney, NV (Las Vegas Bowl)	ESPN2	L 13–20	21,429
*Non-conference game Homecoming Rankings from AP Poll released prior to the game

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No SDSU players were selected in the 1999 NFL Draft.^[3]

The following finished their college career in 1998, were not drafted, but played in the NFL.^[4]

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