Glen Oaks is a neighborhood in the easternmost portion of the New York City Borough of Queens. The neighborhood is part of Queens Community Board 13.

Glen Oaks lies between Grand Central Parkway to the north, Union Turnpike to the south, the Queens/Nassau county border (Lakeville Road) to the east, and the Cross Island Parkway to the west. In this area, the Queens/Nassau border separates New York City from the Village of Lake Success. The Queens/Nassau border is referred to locally as "the city line" and is so designated on New York City buses. Union Turnpike is the main commercial road in the area.

The northern edge of Glen Oaks is a line of hills which are part of the terminal moraine of the last glacial period. These hills include the highest point in Queens: 258.2 feet (78.7 m) above sea level. The southern part of Glen Oaks is a glacial outwash plain.

The postal ZIP code zones for this area do not follow political boundaries, even crossing the city line. The easternmost part of the neighborhood is in the 11040 zip code, addressed as New Hyde Park. The northernmost part of the neighborhood—the North Shore Towers complex—is in the 11005 zip code, addressed as Floral Park. The portion of the neighborhood west of Little Neck Parkway—other than the Queens County Farm Museum—is in the 11426 zip code, addressed as Bellerose. Finally, the central part of the neighborhood is in the 11004 zip code, which may be addressed as either Glen Oaks or Floral Park. Since the zip codes cross the city line, they cannot be used as the sole means to determine sales tax rates. This has caused problems for area residents.

North of Glen Oaks is the Little Neck neighborhood. The Queens neighborhoods of Bellerose and Floral Park lie south of Glen Oaks. The Nassau County villages of Bellerose and Floral Park lie south of the Queens neighborhoods with the same names. East of Glen Oaks (past Lake Success) is the unincorporated neighborhood of North New Hyde Park. South of North New Hyde Park is the Village of New Hyde Park. So even though Glen Oaks shares various postal city names with Nassau County villages, it is not adjacent to those villages and is not politically related to them other than being in the same state.

The right-of-way of the historical Long Island Motor Parkway is now the southernmost edge of the parking lot of Green Meadows Farm. East of Little Neck Parkway, the Motor Parkway route is now 74th Avenue, including Tenney Park. The route also defines the southern border of the North Shore Towers complex (formerly the Glen Oaks Golf Club).

Glen Oaks is dominated by a large garden apartment complex named Glen Oaks Village. The apartment complex has two major sections. One extends from Little Neck Parkway eastwards to 263rd Street, and south to Union Turnpike. The other section extends from Commonwealth Boulevard to 249th Street. Opposite Glen Oaks Village on Little Neck Parkway is another garden apartment complex, Parkwood Estates (originally named Grand Central Apartments). Glen Oaks also includes the North Shore Towers apartment complex and country club and the nearby Royal Ranch community on the same hill.

Glen Oaks is covered by two public elementary (grades K-5) school zones, for P.S. 186 and P.S. 115. Students graduating from these schools attend middle (grades 6-8) school M.S. 172. A Roman Catholic school, Our Lady of the Snows, is an alternative for grades K-8. In 2004, a public school campus—the Frank A. Padavan campus—was opened in western Glen Oaks. This section of land was previously part of the Creedmoor Psychiatric Center. The campus includes The Queens High School of Teaching and two elementary/intermediate (grades K-8) schools: P.S./I.S. 208 and P.S./I.S. 266. P.S./I.S. 266 serves students across District 26, chosen by lottery from applicants. P.S./I.S. 208 does not serve Glen Oaks students. (Its zone includes just the sliver of Glen Oaks west of Commonwealth Boulevard, which is not residential.) Typically the district 26 schools have been ranked among the best in the NYC public school system.

Tenney Park consists of 3 acres (1.2 ha) located at the intersection of 260th street and 74th Avenue (the intersection is a traffic circle around the park). It serves as the home of Glen Oaks Little League as well as having basketball courts and playground equipment. It was originally named Glen Oaks Park. In 1977 it was named Tenney Park after Jerry Tenney, a former owner of Glen Oaks Village. However, it is most commonly known as "the Oval", after its shape. There is also a 2-acre (8,100 m2) playground at Little Neck Parkway and 72nd Avenue, adjacent to P.S. 186. South of the playground on Little Neck Parkway is the Queens County Farm Museum, 47.7 acres (19.3 ha) that re-create of the historic agricultural phase of the county, housing an array of farm animals and antique farming equipment.

Long Island Jewish Medical Center is mostly located in Glen Oaks and is one of the largest medical facilities on Long Island.

Several institutions on or near Union Turnpike are associated with Glen Oaks though they are not actually in Glen Oaks. For example, Bellerose Jewish Center, the Glen Oaks branch of the Queens library, and Glen Oaks School (P.S. 115) are all in the Floral Park neighborhood. So are M.S. 172 and Our Lady of the Snows. In contrast, P.S. 186 is in the center of Glen Oaks, but is named Castlewood School. The Queens County Farm is also in the center of Glen Oaks (and has the Glen Oaks/Floral Park zip code) but the group that operates it is the Colonial Farmhouse Restoration Society of Bellerose.

The Kew Gardens subway station and Midtown Manhattan are accessible from Glen Oaks, using the Q46 bus, the QM5 express bus, or the QM6 express bus. Downtown Manhattan is accessible using the QM8 express bus. There are two different Q46 branches. One branch is routed along 260th Street between Union Turnpike and its terminal on Little Neck Parkway, and the other is routed along Union Turnpike, serving Lakeville Road and Long Island Jewish Medical Center.

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