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Starfleet is a rank-based hierarchy. Both commissioned and non-commissioned officers start at the bottom of the rank structure, and have the chance to earn promotion over the course of their career.

The rank structure has changed numerous times since Starfleet first came into being in the 22nd Century. These are the current ranks that are in use from 2393.

Commissioned Officers

Flag Officers

Rank Command Operations Sciences
Fleet Admiral
R-a4
Y-a4
T-a4
Admiral
R-a3
Y-a3
T-a3
Vice Admiral
R-a2
Y-a2
T-a2

Line Officers

Rank Command Operations Sciences
Captain
R-o6
Y-o6
T-o6
Commander
R-o5
Y-o5
T-o5
Lieutenant Commander
R-o4
Y-o4
T-o4
Lieutenant
R-o3
Y-o3
T-o3
Lieutenant (j.g.)
R-o2
Y-o2
T-o2
Ensign
R-o1
Y-o1
T-o1

Non-commissioned Officers

Rank Command Operations Sciences
Master Chief Petty Officer
R-e9
Y-e9
T-e9
Senior Chief Petty Officer
R-e8
Y-e8
T-e8
Chief Petty Officer
R-e7
Y-e7
T-e7
Petty Officer 1st Class
R-e6
Y-e6
T-e6
Petty Officer 2nd Class
R-e5
Y-e5
T-e5
Petty Officer 3rd Class
R-e4
Y-e4
T-e4
Crewman 1st Class
R-e3
Y-e3
T-e3
Crewman 2nd Class
R-e2
Y-e2
T-e2
Crewman 3rd Class
R-e1
Y-e1
T-e1