| Official Name: | Četvrtkovac |
| Settlement Type: | Village |
| Pushpin Map: | Croatia |
| Pushpin Map Caption: | Location of Četvrtkovac in Croatia |
| Pushpin Label Position: | bottom |
| Coordinates: | 45.3508°N 16.53°W |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Name1: | Continental Croatia (Banovina) |
| Subdivision Type2: | County |
| Subdivision Name2: | Sisak-Moslavina |
| Subdivision Type3: | Municipality |
| Subdivision Name3: | Sunja |
| Unit Pref: | Metric |
| Area Footnotes: | [1] |
| Area Total Km2: | 6.3 |
| Elevation M: | 113 |
| Population As Of: | 2021 |
| Population Total: | 139 |
| Population Density Km2: | auto |
| Timezone: | CET |
| Timezone Dst: | CEST |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 44210 Sunja |
| Area Code: | (+385) 44 |
Četvrtkovac is a village in central Croatia, in the municipality of Sunja, Sisak-Moslavina County. It is located in the Banija region.
According to the 2011 census, the village of Četvrtkovac has 232 inhabitants. This represents 45.58% of its pre-war population.According to the 1991 census,[2] 88.02% of the village population were ethnic Serbs (448/509).
Note: The 1869 data is reported under the Drljača settlement while the 1880 data includes data for the Drljača settlement.