US recording/mastering & vinyl-cutting studios of record company Capitol Studios.

Also credited as:
- Capitol Disk Mastering - Capitol Facility L.A., California
- Capitol Mastering Hollywood, CA
- Capitol Mastering Studios - LA, CA
- Capitol Records, Hollywood
- Capitol Records Mastering
- Capitol Records Mastering Lab
- Capitol Studios Mastering
- Capitol Tower Mastering
Recognizable with "MASTERED BY CAPITOL" stamped on the runout.

Capitol Mastering had Scully and Neumann lathes. The used lathes are indicated in the matrix by the letter following the catalog number (followed by a number indicating the cut number), e.g. A3, F-9, G-22, J17, P-4, R1, W5, X5.
A / B: Scully stereo lathe in Hollywood, 1967-1974.
F / G: Scully mono lathe in Hollywood, 1967-1969.
H / J: Scully lathe in Hollywood, 1969-1983.
P / T: Scully lathe in New York, 1967-1971.
W / X: Scully stereo lathe in New York, 1967-1974.

F: Neumann VMS-66 lathe used by Tower Mastering in Hollywood, California (1969-1982).
G: Neumann lathe in Hollywood (1975-1988).
R: Neumann lathe in New York (1972-1974).

Engineers known to have worked here:
Robert Vosgien