Edward K. Oliver, 31, Jackson, N.J., Carr Futures, Inc., World Trade Center.

Leah Elizabeth Oliver, 24, Brooklyn, N.Y., Marsh & McLennan Companies, Inc., World Trade Center.

Eric Taube Olsen, 41, Staten Island, N.Y., New York City Fire Department, World Trade Center.

Jeffrey James Olsen, 31, Staten Island, N.Y., New York City Fire Department, World Trade Center.

Barbara K. Olson, Passenger, American 77, Pentagon.

Maureen Lyons Olson, 50, Rockville Centre, N.Y., Marsh & McLennan Companies, Inc., World Trade Center.

Steven John Olson, 38, Staten Island, N.Y., New York City Fire Department, World Trade Center.

Toshihiro Onda, 39, New York City, Fuji Bank, Ltd., World Trade Center.

Seamus L. Oneal, 52, New York City, Cantor Fitzgerald, World Trade Center.

Betty Ann Ong, 45, Andover, Mass., Flight Crew, United 11, World Trade Center.

Michael C. Opperman, 45, Selden, N.Y., Aon Corporation, World Trade Center.

Christopher T. Orgielewicz, 35, Larchmont, N.Y., Sandler O'Neill + Partners, World Trade Center.

Margaret Quinn Orloske, 50, Windsor, Conn., Marsh & McLennan Companies, Inc., World Trade Center.

Virginia Anne Ormiston, 42, Marsh & McLennan Companies, Inc., World Trade Center.

Ruben S. Ornedo, 39, Los Angeles, Calif., Passenger, American 77, Pentagon.

Ronald Orsini, 59, Hillsdale, N.J., Cantor Fitzgerald, World Trade Center.

Peter Keith Ortale, 37, Euro Brokers, World Trade Center.

Juan Ortega-Campos, 32, Fine & Schapiro, World Trade Center.

Jane Marie Orth, 49, Haverhill, Mass., Passenger, United 11, World Trade Center.

Alexander Ortiz, 36, Empire BlueCross BlueShield contractor, World Trade Center.