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London Heathrow LHR Terminal 3 Lounges

UNDER CONSTRUCTION

Terminal 3 handles a number of oneworld airlines, including

AA - American Airlines
AY - Finnair
BA - British Airways* (limited destinations)
CX - Cathay Pacific Airways
IB - Iberia (from 12 Jul 2022)
JL - Japan Airlines
RJ - Royal Jordanian
QF - Qantas Airways
UL - SriLankan Airlines

Note: Most British Airways flights depart Terminal 5, not connected airside other than by interterminal buses requiring connecting boarding passes and security procedures.

Some unaligned and SkyTeam member airlines also use Terminal 3
Star Alliance member airlines use Terminal 2

Terminal 3 houses several oneworld lounges:
American Airlines Admirals Club - Lounge Area H (currently closed)
American Airlines Arrivals Lounge - landside, restricted access (link)
American Airlines International First Class Lounge - Lounge Area H (closed)
British Airways Galleries Club Lounge - Zone F (link)
British Airways Galleries First Lounge - Zone F (link)
Cathay Pacific Business Lounge - (link)
Cathay Pacific First Class Lounge - (link)
Qantas London Lounge - Lounges Zone B (link)

Other lounges (pay, membership, lounge access schemes)
No. 1 Heathrow Lounge (pay) - near Gates 13-22 (link)
No. 1 Lounge pod hotel (link)
Club Aspire Lounge - near Gate 9
Plaza Premium Arrivals Lounge - Ground Floor, Arrivals

Distinctive characteristics:
Cathay Pacific Lounge - Noodle Bar
Qantas Lounges - Gin Bar
Cathay Pacific and BA First Dining are the only areas that offer meaningful tarmac views