diff --git a/src/main/kotlin/roomescape/schedule/business/ScheduleService.kt b/src/main/kotlin/roomescape/schedule/business/ScheduleService.kt
new file mode 100644
index 00000000..7a44d88b
--- /dev/null
+++ b/src/main/kotlin/roomescape/schedule/business/ScheduleService.kt
@@ -0,0 +1,123 @@
+package roomescape.schedule.business
+
+import ScheduleException
+import com.github.f4b6a3.tsid.TsidFactory
+import io.github.oshai.kotlinlogging.KLogger
+import io.github.oshai.kotlinlogging.KotlinLogging
+import org.springframework.data.repository.findByIdOrNull
+import org.springframework.stereotype.Service
+import org.springframework.transaction.annotation.Transactional
+import roomescape.common.config.next
+import roomescape.member.business.MemberService
+import roomescape.schedule.exception.ScheduleErrorCode
+import roomescape.schedule.infrastructure.persistence.ScheduleEntity
+import roomescape.schedule.infrastructure.persistence.ScheduleRepository
+import roomescape.schedule.infrastructure.persistence.ScheduleStatus
+import roomescape.schedule.web.*
+import java.time.LocalDate
+
+private val log: KLogger = KotlinLogging.logger {}
+
+@Service
+class ScheduleService(
+    private val scheduleRepository: ScheduleRepository,
+    private val scheduleValidator: ScheduleValidator,
+    private val tsidFactory: TsidFactory,
+    private val memberService: MemberService
+) {
+
+    @Transactional(readOnly = true)
+    fun findThemesByDate(date: LocalDate): AvailableThemeIdListResponse {
+        log.info { "[ScheduleService.findThemesByDate] 동일한 날짜의 모든 테마 조회: date=$date" }
+
+        return scheduleRepository.findAllByDate(date)
+            .toThemeIdListResponse()
+            .also {
+                log.info { "[ScheduleService.findThemesByDate] date=${date}인 ${it.themeIds.size}개 테마 조회 완료" }
+            }
+    }
+
+    @Transactional(readOnly = true)
+    fun findSchedules(date: LocalDate, themeId: Long): ScheduleRetrieveListResponse {
+        log.info { "[ScheduleService.findSchedules] 동일한 날짜와 테마인 모든 일정 조회: date=${date}, themeId=${themeId}" }
+
+        return scheduleRepository.findAllByDateAndThemeId(date, themeId)
+            .toRetrieveListResponse()
+            .also {
+                log.info { "[ScheduleService.findSchedules] date=${date}, themeId=${themeId}인 ${it.schedules.size}개 일정 조회 완료" }
+            }
+    }
+
+    @Transactional(readOnly = true)
+    fun findDetail(id: Long): ScheduleDetailRetrieveResponse {
+        log.info { "[ScheduleService.findDetail] 일정 상세 정보조회 시작: id=$id" }
+
+        val schedule: ScheduleEntity = findOrThrow(id)
+
+        val createdBy = memberService.findById(schedule.createdBy).name
+        val updatedBy = memberService.findById(schedule.updatedBy).name
+
+        return schedule.toDetailRetrieveResponse(createdBy, updatedBy)
+            .also {
+                log.info { "[ScheduleService.findDetail] 일정 상세 조회 완료: id=$id" }
+            }
+    }
+
+    @Transactional
+    fun createSchedule(request: ScheduleCreateRequest): ScheduleCreateResponse {
+        log.info { "[ScheduleService.createSchedule] 일정 생성 시작: date=${request.date}, time=${request.time}, themeId=${request.themeId}" }
+
+        scheduleValidator.validateCanCreate(request)
+
+        val schedule = ScheduleEntity(
+            id = tsidFactory.next(),
+            date = request.date,
+            time = request.time,
+            themeId = request.themeId,
+            status = ScheduleStatus.AVAILABLE
+        )
+
+        return ScheduleCreateResponse(scheduleRepository.save(schedule).id)
+            .also {
+                log.info { "[ScheduleService.createSchedule] 일정 생성 완료: id=${it.id}" }
+            }
+    }
+
+    @Transactional
+    fun updateSchedule(id: Long, request: ScheduleUpdateRequest) {
+        log.info { "[ScheduleService.updateSchedule] 일정 수정 시작: id=$id, request=${request}" }
+        val schedule: ScheduleEntity = findOrThrow(id)
+
+        scheduleValidator.validateCanUpdate(schedule, request)
+
+        schedule.modifyIfNotNull(
+            request.time,
+            request.status
+        ).also {
+            log.info { "[ScheduleService.updateSchedule] 일정 수정 완료: id=$id, request=${request}" }
+        }
+    }
+
+    @Transactional
+    fun deleteSchedule(id: Long) {
+        log.info { "[ScheduleService.deleteSchedule] 일정 삭제 시작: id=$id" }
+
+        val schedule: ScheduleEntity = findOrThrow(id)
+
+        scheduleValidator.validateCanDelete(schedule)
+
+        scheduleRepository.delete(schedule).also {
+            log.info { "[ScheduleService.deleteSchedule] 일정 삭제 완료: id=$id" }
+        }
+    }
+
+    private fun findOrThrow(id: Long): ScheduleEntity {
+        log.info { "[ScheduleService.findOrThrow] 일정 조회 시작: id=$id" }
+
+        return scheduleRepository.findByIdOrNull(id)
+            ?: run {
+                log.warn { "[ScheduleService.updateSchedule] 일정 조회 실패. id=$id" }
+                throw ScheduleException(ScheduleErrorCode.SCHEDULE_NOT_FOUND)
+            }
+    }
+}
diff --git a/src/main/kotlin/roomescape/schedule/business/ScheduleValidator.kt b/src/main/kotlin/roomescape/schedule/business/ScheduleValidator.kt
new file mode 100644
index 00000000..d609b9fa
--- /dev/null
+++ b/src/main/kotlin/roomescape/schedule/business/ScheduleValidator.kt
@@ -0,0 +1,67 @@
+package roomescape.schedule.business
+
+import ScheduleException
+import io.github.oshai.kotlinlogging.KLogger
+import io.github.oshai.kotlinlogging.KotlinLogging
+import org.springframework.stereotype.Component
+import roomescape.schedule.exception.ScheduleErrorCode
+import roomescape.schedule.infrastructure.persistence.ScheduleEntity
+import roomescape.schedule.infrastructure.persistence.ScheduleRepository
+import roomescape.schedule.infrastructure.persistence.ScheduleStatus
+import roomescape.schedule.web.ScheduleCreateRequest
+import roomescape.schedule.web.ScheduleUpdateRequest
+import java.time.LocalDate
+import java.time.LocalDateTime
+import java.time.LocalTime
+
+private val log: KLogger = KotlinLogging.logger {}
+
+@Component
+class ScheduleValidator(
+    private val scheduleRepository: ScheduleRepository
+) {
+    fun validateCanDelete(schedule: ScheduleEntity) {
+        val status: ScheduleStatus = schedule.status
+
+        if (status !in listOf(ScheduleStatus.AVAILABLE,ScheduleStatus.BLOCKED)) {
+            log.info { "[ScheduleValidator.validateCanDelete] 삭제 실패: id=${schedule.id} / status=${status}" }
+            throw ScheduleException(ScheduleErrorCode.SCHEDULE_IN_USE)
+        }
+    }
+
+    fun validateCanUpdate(schedule: ScheduleEntity, request: ScheduleUpdateRequest) {
+        val date: LocalDate = schedule.date
+        val time: LocalTime = request.time ?: schedule.time
+
+        validateDateTime(date, time)
+    }
+
+    fun validateCanCreate(request: ScheduleCreateRequest) {
+        val date: LocalDate = request.date
+        val time: LocalTime = request.time
+        val themeId: Long = request.themeId
+
+        validateAlreadyExists(date, themeId, time)
+        validateDateTime(date, time)
+    }
+
+    private fun validateAlreadyExists(date: LocalDate, themeId: Long, time: LocalTime) {
+        if (scheduleRepository.existsByDateAndThemeIdAndTime(date, themeId, time)) {
+            log.info {
+                "[ScheduleValidator.validateAlreadyExists] 동일한 날짜, 테마, 시간 존재: date=${date} / themeId=${themeId} / time=${time}"
+            }
+            throw ScheduleException(ScheduleErrorCode.SCHEDULE_ALREADY_EXISTS)
+        }
+    }
+
+    private fun validateDateTime(date: LocalDate, time: LocalTime) {
+        val dateTime = LocalDateTime.of(date, time)
+
+        if (dateTime.isBefore(LocalDateTime.now())) {
+            log.info {
+                "[ScheduleValidator.validateDateTime] 이전 시간 선택: date=${date} / time=${time}"
+            }
+            throw ScheduleException(ScheduleErrorCode.PAST_DATE_TIME)
+        }
+    }
+}