Former Parliament president Somsak Kiartsuranon and former vice Parliament President Nikhom Wairatpanich escaped impeachment in another case.
The NLA members cast their votes in secret ballots on the two cases at the same time, starting at 11am. The results were known at noon.
The impeachment bans Yingluck from politics for five years.
She was accused by the National Anti-Corruption Commission of negligence as duty as the prime minister, failing to act to stop massive corruption in the rice pledging-scheme.
Eighteen NLA members voted to reject the impeachment request. Eight NLA members abstained and three ballots were declared invalid.
Somsak and Nikhom were accused by the NACC of abusing their authority as Parliament president and vice president to push through charter amendments on the Senate composition.
The 220-member NLA failed to muster three fifths votes to approve the impeachment request against Somsak and Nikhom.
Only 100 NLA members supported the impeachment request against Somsak while 115 NLA members voted to reject the request. Four other NLA members abstained.
A total of 95 NLA members voted to support the impeachment request against Nikhom while 120 NLA members voted to reject the request.