Yeoman is a title, the equivalent of which is used by the service organizations of many civilizations. As a Starfleet rating, yeoman is an enlisted title, a petty officer senior to a crewman. In comparison to army or military ranking systems, a yeoman's equivalent grade would depend on the petty officer class of the yeoman. A yeoman third class would be approximately equivalent to a corporal, higher grades would have the authority of a sergeant.
Starfleet uses different rates of yeoman, such as "yeoman first class", "yeoman second class", and "yeoman third class". A yeoman who is promoted beyond chief petty officer could be referred to as "chief yeoman", "senior chief yeoman" or "master chief yeoman" as they move through the grades. Likewise, a crewmember in the same job rating with the rate (rank) below that would have the full title of "yeoman crewman".
Janice Rand introduced Yeoman Third Class Tina Lawton to Charles Evans since they were close in age, but the boy rejected Lawton because of his infatuation with Rand. (TOS: "Charlie X")
Insignia
| Yeoman recruit | Yeoman apprentice | Yeoman crewman | |
|---|---|---|---|
| Earth Starfleet | 
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| 2260s | 
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| 2270s |   |
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| Late 2270s | N/A |   | |
| 2350s-2360s | 
| ||
| 2360s-2370s service uniform |
|
 |
 |
| 2360s-2370s duty uniform |
|
 |
 |
| 2370s-2380s | 
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|
| Yeoman third class | Yeoman second class | Yeoman first class | |
|---|---|---|---|
| Earth Starfleet |  |
 |
 |
| 2260s |
| ||
| 2270s |  |
 |
 |
| Late 2270s | N/A |  |
 |
| 2350s-2360s |
| ||
| 2360s-2370s service uniform |
 |
 |
 |
| 2360s-2370s duty uniform |
 |
 |
 |
| 2370s-2380s | |
|
|
| Chief yeoman | Senior chief yeoman | Master chief yeoman | |
|---|---|---|---|
| Earth Starfleet |  |
 |
 |
| 2260s |
| ||
| 2270s |  |
 |
 |
| Late 2270s |  |
 |
 |
| 2350s-2360s |  | ||
| 2360s-2370s service uniform |
 |
 |
 |
| 2360s-2370s duty uniform |
 |
 |
 |
| 2370s-2380s | |
|
|
External links
Yeoman article at Memory Alpha, the canon Star Trek wiki.