Kyiv Oblast' Archives
Digitized files can be found from the link opisi.dako.gov.ua, with pre-1917 records at opisi.dako.gov.ua/opisi/firstpage?nametable=firstpage&fondtext=%D0%94%D0%BE%201917 and post-1917 records at opisi.dako.gov.ua/opisi/firstpage?nametable=radfirstpage&fondtext=1917%20-%201991.
Case files on former Ostarbeiters and "filtration" of repatriated individuals
The files on former Ostarbeiters seem to have gone missing online. If anybody is aware of the new URL for these records, please let us know. Meanwhile, there are digitized case files of those who were repatriated after World War II: https://opisi.dako.gov.ua/site/filtration
The archives also has an online exhibition on Ostarbeiters: dako.gov.ua/%d0%be%d1%81%d1%82%d0%b0%d1%80%d0%b1%d0%b0%d0%b9%d1%82%d0%b5%d1%80%d0%b8-%d0%ba%d0%b8%d1%97%d0%b2%d1%89%d0%b8%d0%bd%d0%b8-%d0%b4%d0%be%d0%ba%d1%83%d0%bc%d0%b5%d0%bd%d1%82%d0%b8-2/
Metrical records
Metrical books from the Rivne Oblast’ Archives
https://rv.archives.gov.ua/ocifrovani-sprav?period=5&&fund=5&&annotation=6
Khmel’nyts’kyi Oblast’ Archives
(Orthodox) Spiritual Consistory records
https://dahmo.gov.ua/viev_pid_cat.php?pid_cat=69
Roman Catholic Spiritual Consistory records
https://dahmo.gov.ua/viev_pid_cat.php?pid_cat=70
“Kazenna Palata” of Podil’sk records
https://dahmo.gov.ua/viev_pid_cat.php?pid_cat=72
Volyn’ Oblast’ Archives
“Criminal cases of non-judicial bodies”
Records regarding residents of Luts’k who were repressed and later rehabilitated.
https://volyn.archives.gov.ua/elekt_archives/elekt_spravi/sprav.php
Kherson Gubernia records digitized by Alex Krakovsky
His "Ievreis'ke Mistechko" ("Jewish Town") WikiSource has many more records focused primarily (but not exclusively) on the Jewish population of Ukraine: https://uk.wikisource.org/wiki/%D0%90%D1%80%D1%85%D1%96%D0%B2:%D0%84%D0%B2%D1%80%D0%B5%D0%B9%D1%81%D1%8C%D0%BA%D0%B5_%D0%BC%D1%96%D1%81%D1%82%D0%B5%D1%87%D0%BA%D0%BE