Kriengsak or Kriangsak () is a Thai given name. Notable people with the name include:
Kriangsak Chamanan (1917–2003), prime minister of Thailand from 1977 to 1980 Kriengsak Chareonwongsak, Thai scholar and politician Kriengsak Kovitvanit (born 1949), Archbishop of Bangkok Kriengsak Nukulsompratana (born 1948), Thai footballer Kriengsak Varavudhi (born 1948), Thai cyclist Kriengsak Vimolsate (born 1942), Thai footballer