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Upper Sorbian has the following declinable interrogative pronouns: štó who, što what, kajki what kind of, kotry which, čeji whose.
The pronouns štó and što are only used in singular. Štó is inherently masculine and što is inherently neuter. All the words that reffer to these pronouns in a sentence and are inflected for number and/or gender must take the singular masculine and singular neuter form respectively, even if the noun in question is of another number and gender.
| Štó | je | přišoł? | |
| who Nom. | be 3.sing.pres. | come past.part. sing.masc. | |
| subject | compound verb | ||
| Who has come? | |||
| Što | je | so | stało? |
| what Nom. | be 3.sing.pres. | refl. | happen past.part. sing.neut. |
| subject | compound verb | ||
| What has happened? | |||
The pronouns kajki, kotry and čeji decline for case, number and gender.
štó who and što what
| N | štó | što |
| G | koho | čeho |
| D | komu | čemu |
| A | koho | što, čo |
| I | (z) kim | (z) čim |
| L | (w) kim | (w) čim |
The accusative of što is čo when it stands after a preposition and što in all other cases.
kajki what kind of
| singular | dual | plural | ||||||
| masc. | fem. | neut. | vir. | nonvir. | vir. | nonvir. | ||
| N | kajki | kajka | kajke | kajkaj | kajkej | kajcy | kajke | |
| G | kajkeho | kajkeje | kajkeho | kajkeju | kajkich | |||
| D | kajkemu | kajkej | kajkemu | kajkimaj | kajkim | |||
| A | kajkeho | kajki | kajku | kajke | kajkeju | kajkej | kajkich | kajke |
| I | (z) kajkim | (z) kajkej | (z) kajkim | (z) kajkimaj | (z) kajkimi | |||
| L | (w) kajkim | (w) kajkej | (w) kajkim | (w) kajkimaj | (w) kajkich | |||
kotry which
| singular | dual | plural | ||||||
| masc. | fem. | neut. | vir. | nonvir. | vir. | nonvir. | ||
| N | kotry | kotra | kotre | kotraj | kotrej | kotři | kotre | |
| G | kotreho | kotreje | kotreho | kotreju | kotrych | |||
| D | kotremu | kotrej | kotremu | kotrymaj | kotrym | |||
| A | kotry | kotreho | kotru | kotre | kotreju | kotrej | kotrych | kotre |
| I | (z) kotrym | (z) kotrej | (z) kotrym | (z) kotrymaj | (z) kotrymi | |||
| L | (w) kotrym | (w) kotrej | (w) kotrym | (w) kotrymaj | (w) kotrych | |||
čeji whose
| singular | dual | plural | ||||||
| masc. | fem. | neut. | vir. | nonvir. | vir. | nonvir. | ||
| N | čeji | čeja | čeje | čejej | čeji | čeje | ||
| G | čejeho | čejeje | čejeho | čejeju | čejich | |||
| D | čejemu | čejej | čejemu | čejimaj | čejim | |||
| A | čeji | čejeho | čeju | čeje | čejeju | čejej | čejich | čeje |
| I | (z) čejim | (z) čejej | (z) čejim | (z) čejimaj | (z) čejimi | |||
| L | (w) čejim | (w) čejej | (w) čejim | (w) čejimaj | (w) čejich | |||