| Old Siam, Sir | |
| Cover: | Old Siam, Sir cover.jpg |
| Type: | single |
| Artist: | Wings |
| Album: | Back to the Egg |
| B-Side: | Spin It On |
| Released: | (UK) |
| Recorded: | 23 July 1978 |
| Genre: | Hard rock |
| Label: | Parlophone/EMI (UK) |
| Producer: |
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| Prev Title: | Goodnight Tonight |
| Prev Year: | 1979 |
| Next Title: | Getting Closer |
| Next Year: | 1979 |
"Old Siam, Sir" is a hard rock single from Wings' 1979 album, Back to the Egg. It was the A-side of the UK version of the single, reaching No. 35.[1] The B-side, "Spin It On" in the UK was also a track from the album, "Back to the Egg". "Old Siam, Sir" was also the B-side of the US single "Arrow Through Me".
Wings drummer Steve Holley, while playing keyboards during a studio session, developed a chord sequence that was eventually used in the instrumental section of the song.[2] Paul McCartney and guitarist Denny Laine later recorded an instrumental demo for the song called "Super Big Heatwave".