Harry Stanton, the head track and cross country coach and long-time assistant football coach at Theodore Roosevelt, collapsed and died while teaching his life skills class yesterday at the Northwest D.C. school. According to school officials, Stanton, 45, had kidney problems and had been undergoing treatment on a dialysis machine.

Stanton, a star football player at Roosevelt and graduate of D.C. Teachers College, taught physical education and health in the D.C. School system more than 20 years. He assisted Jim Tillerson at Roosevelt a number of years and had been head track coach for five. Known as a disciplinarian, Stanton coached basketball several years in junior high and a number of his athletes went to college.

He also was a high school basketball official for almost 15 years, stepping down two seasons ago for health reasons.

"Harry was the type of person you could call at 6:05 for a 6:30 game and he would put his dinner down and get there," said IAABO Board 12 Commissioner Joe Morrisey, who worked with Stanton for many years. "He was highly respected, always a gentleman and dedicated to youth." Old Mill Wins

Anne Arundel County track and field power Old Mill won both the boys and girls championships at a county indoor invitational meet last week at the Fifth Regiment Armory in Baltimore. The boys team finished ahead of the eight-school field with 101 points. Meade was runner-up with 86, Broadneck third with 69, Severna Park had 66 and Glen Burnie 48.

The girls team had 100 points with Meade and Severna Park tied for second place with 57. Chesapeake had 40 and Broadneck 38.

Glenelg's Tony Dedmond won the 500-meter dash in 1:11.8 to lead his team to the title in a five-school invitational at the Armory. Centennial was second, Howard third. Flynn Picks Up Panthers

Annapolis's Pat Flynn, the 4A state wrestling runner-up at 135 pounds and 28-2 last year, has picked up where he left off last season. The senior, who has wrestled this year at 145 and 152, had his 10th pin of the season as he won the 152-pound title at the Arundel Invitational tournament Saturday. Flynn (16-0) and teammates Ford Baumgardener (12-0) at 135 pounds and 145-pound Chip Cochran (16-1) won titles to help Annapolis take the meet with 146 points. Quince Orchard had 139.5, and Oakland Mills was third with 134.5 in the eight school meet.

Other champions included Oakland Mills's Dan Bickell (112), Kalev Freeman (119) and Adam Seidman (125) and Arundel's Pat Beach (heavyweight).

Suitland improved to 7-0 by beating Prince George's County rivals Largo and Surrattsville in a big tri-meet. Suitland's Kwabena Asomoah (130), Tionne Bennett (152) and Damon Stephens (135) were among individual winners.

Northern Virginia's top-ranked team Centreville won its first big test, outdueling No. 2-ranked Robinson before more than 2,000 at Centreville Saturday. Centreville's big triumph was fueled by freshman Marty Maier's victory over senior Greg Bosco in the 112-pound class. Centreville's Woody Gosser (140), Scott Lancaster (171) and Mark Zimbro (189) won by a point. Streak Continues

Virginia AAA North Stafford's successful girls' gymnastics team scored 107.60 points to win the Park View Invitational gymnastics tournament Saturday. The win kept the Wolverines' three-year winning streak intact. Broad Run had 101 and Stafford 100.30 in the meet's top-seeded Blue Division. In the lower-seeded Red Division, Chancellor upset defending champion Lake Braddock, 94.50-93.85.

North Stafford's Kenna Benson won the all-around title with 37.20 points. Broad Run's Lucy Rankin was runner-up with 36.50. Benson's teammate Terri Fleming finished third with 36.45. Benson won the uneven bars, Fleming the floor exercise, Rankin the balance beam and Park View's Stacy Spitzer the vaulting event.

In the Red Division, Chancellor's Linda McLain won the all-around title with 33.55 points. Langley's Christie Oller was second with 32.30. McLain won the balance beam, vaulting and floor exercise events and Lake Braddock's Anne Weiss won the uneven bars. Football Rebounds

Despite the continuing criticism of high school football as being too dangerous, the National Federation of State High School Associations reported an increase of participation in 1990 over the previous season.