No. The lock action is the one you take to gain the lock.

1 minute ago, dmcgee1 said:

"R3 Astromech (3)

You can maintain up to 2 locks. Each lock must be on a different object.
After you perform a [Lock] action, you may acquire a lock."

Does this allow me to spend a Lock to reroll dice, and then immediately acquire a Lock. In other words, is spending a Lock considered a Lock action?

Spending a Lock for rerolls is not a Lock Action.

Thanks for the answers!