diff --git a/app/src/main/java/agzam/vyatsu/domain/model/BulkSyncProgress.kt b/app/src/main/java/agzam/vyatsu/domain/model/BulkSyncProgress.kt
new file mode 100644
index 0000000..3ec0d06
--- /dev/null
+++ b/app/src/main/java/agzam/vyatsu/domain/model/BulkSyncProgress.kt
@@ -0,0 +1,7 @@
+package agzam.vyatsu.domain.model
+
+data class BulkSyncProgress(
+    val total: Int,
+    val done: Int,
+    val failed: Int
+)
\ No newline at end of file
diff --git a/app/src/main/java/agzam/vyatsu/domain/model/Department.kt b/app/src/main/java/agzam/vyatsu/domain/model/Department.kt
new file mode 100644
index 0000000..28f9198
--- /dev/null
+++ b/app/src/main/java/agzam/vyatsu/domain/model/Department.kt
@@ -0,0 +1,11 @@
+package agzam.vyatsu.domain.model
+
+/**
+ * Кафедра ВятГУ.
+ * departmentId — идентификатор кафедры из data-kaf_period_id без последней цифры (как в URL).
+ */
+data class Department(
+    val departmentId: String,
+    val name: String,
+    val faculty: String
+)
\ No newline at end of file
diff --git a/app/src/main/java/agzam/vyatsu/domain/model/ParsedDepartments.kt b/app/src/main/java/agzam/vyatsu/domain/model/ParsedDepartments.kt
new file mode 100644
index 0000000..b93e462
--- /dev/null
+++ b/app/src/main/java/agzam/vyatsu/domain/model/ParsedDepartments.kt
@@ -0,0 +1,6 @@
+package agzam.vyatsu.domain.model
+
+data class ParsedDepartments(
+    val departments: List<Department>,
+    val dateRanges: Map<String, Map<Season, List<DateRange>>>
+)
\ No newline at end of file
diff --git a/app/src/main/java/agzam/vyatsu/domain/model/Teacher.kt b/app/src/main/java/agzam/vyatsu/domain/model/Teacher.kt
new file mode 100644
index 0000000..020c663
--- /dev/null
+++ b/app/src/main/java/agzam/vyatsu/domain/model/Teacher.kt
@@ -0,0 +1,11 @@
+package agzam.vyatsu.domain.model
+
+/**
+ * Преподаватель ВятГУ.
+ * Один и тот же преподаватель может вести занятия в нескольких кафедрах,
+ * поэтому модель не привязана к departmentId — расписание агрегируется
+ * по всем кафедрам периода.
+ */
+data class Teacher(
+    val name: String
+)
\ No newline at end of file
diff --git a/app/src/main/java/agzam/vyatsu/domain/model/TeacherSchedule.kt b/app/src/main/java/agzam/vyatsu/domain/model/TeacherSchedule.kt
new file mode 100644
index 0000000..03a9f13
--- /dev/null
+++ b/app/src/main/java/agzam/vyatsu/domain/model/TeacherSchedule.kt
@@ -0,0 +1,57 @@
+package agzam.vyatsu.domain.model
+
+import java.time.LocalDate
+import java.time.LocalTime
+
+/**
+ * Расписание преподавателя за период, агрегированное по всем кафедрам.
+ */
+data class TeacherSchedule(
+    val period: SchedulePeriod,
+    val days: List<Day>
+) {
+    /**
+     * Возвращает дни периода только с занятиями указанного преподавателя.
+     * Слоты без занятий отбрасываются, порядок [Day] и [TimeSlot] сохраняется.
+     *
+     * Дедупликация — ТОЛЬКО по полному совпадению (дата + слот + аудитория +
+     * группа + предмет + тип + raw): два занятия коллапсируют в одно лишь когда
+     * они идентичны целиком (одно физическое занятие, прочитанное из файлов двух
+     * кафедр). Всё, что отличается хотя бы одним полем, остаётся и показывается.
+     */
+    fun daysForTeacher(teacherName: String): List<Day> =
+        days.mapNotNull { day ->
+            val seen = HashSet<FullMatchKey>()
+            val intervals = day.intervals.mapNotNull { slot ->
+                val lessons = slot.lessons
+                    .filter { it.teacher == teacherName }
+                    .filter {
+                        seen.add(
+                            FullMatchKey(
+                                date = day.date,
+                                start = slot.start,
+                                end = slot.end,
+                                room = it.room,
+                                group = it.group,
+                                subject = it.subject,
+                                type = it.type,
+                                raw = it.raw
+                            )
+                        )
+                    }
+                if (lessons.isEmpty()) null else slot.copy(lessons = lessons)
+            }
+            if (intervals.isEmpty()) null else day.copy(intervals = intervals)
+        }
+
+    private data class FullMatchKey(
+        val date: LocalDate,
+        val start: LocalTime,
+        val end: LocalTime,
+        val room: String?,
+        val group: String?,
+        val subject: String?,
+        val type: LessonType,
+        val raw: String
+    )
+}
\ No newline at end of file
diff --git a/app/src/main/java/agzam/vyatsu/domain/repository/PreferencesRepository.kt b/app/src/main/java/agzam/vyatsu/domain/repository/PreferencesRepository.kt
index 412b004..1c71b79 100644
--- a/app/src/main/java/agzam/vyatsu/domain/repository/PreferencesRepository.kt
+++ b/app/src/main/java/agzam/vyatsu/domain/repository/PreferencesRepository.kt
@@ -9,6 +9,14 @@ interface PreferencesRepository {
     suspend fun selectedDayDate(): String?
     suspend fun setSelectedDayDate(date: String)
 
+    suspend fun selectedTeacherId(): String? = null
+    suspend fun setSelectedTeacherId(id: String) = Unit
+    suspend fun selectedTeacherWeekStart(): String? = null
+    suspend fun setSelectedTeacherWeekStart(weekStart: String) = Unit
+    suspend fun selectedTeacherDayDate(): String? = null
+    suspend fun setSelectedTeacherDayDate(date: String) = Unit
+    suspend fun clearSelectedTeacher() = Unit
+
     suspend fun autoUpdateEnabled(): Boolean
     suspend fun setAutoUpdateEnabled(enabled: Boolean)
 
diff --git a/app/src/main/java/agzam/vyatsu/domain/repository/TeacherRepository.kt b/app/src/main/java/agzam/vyatsu/domain/repository/TeacherRepository.kt
new file mode 100644
index 0000000..3733c0e
--- /dev/null
+++ b/app/src/main/java/agzam/vyatsu/domain/repository/TeacherRepository.kt
@@ -0,0 +1,12 @@
+package agzam.vyatsu.domain.repository
+
+import agzam.vyatsu.domain.model.Department
+import kotlinx.coroutines.flow.Flow
+
+interface TeacherRepository {
+    fun observeDepartments(): Flow<List<Department>>
+    suspend fun getDepartments(): List<Department>
+    suspend fun getFaculties(): List<String>
+    suspend fun refreshIfStale(): Boolean
+    suspend fun forceRefresh(): Boolean
+}
\ No newline at end of file
diff --git a/app/src/main/java/agzam/vyatsu/domain/repository/TeacherScheduleRepository.kt b/app/src/main/java/agzam/vyatsu/domain/repository/TeacherScheduleRepository.kt
new file mode 100644
index 0000000..a685c76
--- /dev/null
+++ b/app/src/main/java/agzam/vyatsu/domain/repository/TeacherScheduleRepository.kt
@@ -0,0 +1,16 @@
+package agzam.vyatsu.domain.repository
+
+import agzam.vyatsu.domain.model.BulkSyncProgress
+import agzam.vyatsu.domain.model.SchedulePeriod
+import agzam.vyatsu.domain.model.Teacher
+import agzam.vyatsu.domain.model.TeacherSchedule
+import kotlinx.coroutines.flow.Flow
+import java.time.LocalDate
+
+interface TeacherScheduleRepository {
+    fun observeTeachers(period: SchedulePeriod): Flow<List<Teacher>>
+    fun observeSchedule(period: SchedulePeriod): Flow<TeacherSchedule?>
+    suspend fun syncPeriod(date: LocalDate): Flow<BulkSyncProgress>
+    suspend fun hasData(period: SchedulePeriod): Boolean
+    suspend fun clearAll()
+}
\ No newline at end of file
diff --git a/app/src/test/java/agzam/vyatsu/TeacherScheduleDomainTest.kt b/app/src/test/java/agzam/vyatsu/TeacherScheduleDomainTest.kt
new file mode 100644
index 0000000..1d80db6
--- /dev/null
+++ b/app/src/test/java/agzam/vyatsu/TeacherScheduleDomainTest.kt
@@ -0,0 +1,127 @@
+package agzam.vyatsu
+
+import agzam.vyatsu.domain.model.Day
+import agzam.vyatsu.domain.model.Lesson
+import agzam.vyatsu.domain.model.LessonType
+import agzam.vyatsu.domain.model.SchedulePeriod
+import agzam.vyatsu.domain.model.Season
+import agzam.vyatsu.domain.model.TeacherSchedule
+import agzam.vyatsu.domain.model.TimeSlot
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertTrue
+import org.junit.Test
+import java.time.LocalDate
+import java.time.LocalTime
+
+class TeacherScheduleDomainTest {
+
+    @Test
+    fun daysForTeacherFiltersAndPreservesOrder() {
+        val date1 = LocalDate.of(2026, 9, 14)
+        val date2 = LocalDate.of(2026, 9, 15)
+        val slot1 = TimeSlot(
+            LocalTime.of(8, 20),
+            LocalTime.of(9, 50),
+            listOf(lesson(room = "4-302", teacher = "A"), lesson(room = "5-100", teacher = "B"))
+        )
+        val slot2 = TimeSlot(
+            LocalTime.of(10, 0),
+            LocalTime.of(11, 30),
+            listOf(lesson(room = "5-100", teacher = "B"))
+        )
+        val day2Slot = TimeSlot(
+            LocalTime.of(8, 20),
+            LocalTime.of(9, 50),
+            listOf(lesson(room = "5-100", teacher = "B"))
+        )
+        val schedule = TeacherSchedule(
+            period = SchedulePeriod(date1, date2, Season.AUTUMN),
+            days = listOf(Day(date1, listOf(slot1, slot2)), Day(date2, listOf(day2Slot)))
+        )
+
+        val result = schedule.daysForTeacher("A")
+
+        assertEquals(1, result.size)
+        assertEquals(date1, result[0].date)
+        assertEquals(1, result[0].intervals.size)
+        assertEquals(LocalTime.of(8, 20), result[0].intervals[0].start)
+        assertEquals(1, result[0].intervals[0].lessons.size)
+        assertEquals("A", result[0].intervals[0].lessons[0].teacher)
+    }
+
+    @Test
+    fun daysForTeacherDropsDayWithoutTeacher() {
+        val date1 = LocalDate.of(2026, 9, 14)
+        val date2 = LocalDate.of(2026, 9, 15)
+        val schedule = TeacherSchedule(
+            period = SchedulePeriod(date1, date2, Season.AUTUMN),
+            days = listOf(
+                Day(date1, listOf(slotOf(lesson(room = "4-302", teacher = "A")))),
+                Day(date2, listOf(slotOf(lesson(room = "5-100", teacher = "B"))))
+            )
+        )
+
+        val result = schedule.daysForTeacher("A")
+
+        assertEquals(1, result.size)
+        assertEquals(date1, result[0].date)
+    }
+
+    @Test
+    fun dedupCollapsesOnlyIdenticalLessons() {
+        val date = LocalDate.of(2026, 9, 14)
+        val raw = "4-302 Программирование Лекция ИВТб-3304-01-00"
+        val identical = lesson(
+            room = "4-302",
+            group = "ИВТб-3304-01-00",
+            teacher = "A",
+            raw = raw,
+            subject = "Программирование"
+        )
+        val differsInGroup = identical.copy(group = "ИВТб-3304-02-00")
+        val differsInRoom = identical.copy(room = "5-102")
+
+        val schedule = TeacherSchedule(
+            period = SchedulePeriod(date, date, Season.AUTUMN),
+            days = listOf(
+                Day(
+                    date,
+                    listOf(
+                        TimeSlot(
+                            LocalTime.of(8, 20),
+                            LocalTime.of(9, 50),
+                            listOf(identical, identical, differsInGroup, differsInRoom)
+                        )
+                    )
+                )
+            )
+        )
+
+        val result = schedule.daysForTeacher("A")
+
+        val lessons = result[0].intervals[0].lessons
+        assertEquals(3, lessons.size)
+        assertEquals(1, lessons.count { it == identical })
+        assertEquals(1, lessons.count { it.room == "4-302" && it.group == "ИВТб-3304-01-00" })
+        assertTrue(lessons.any { it.group == "ИВТб-3304-02-00" })
+        assertTrue(lessons.any { it.room == "5-102" })
+    }
+
+    private fun slotOf(lesson: Lesson) =
+        TimeSlot(LocalTime.of(8, 20), LocalTime.of(9, 50), listOf(lesson))
+
+    private fun lesson(
+        room: String,
+        group: String = "ИВТб-3304-01-00",
+        teacher: String,
+        raw: String = "$room Программирование Лекция $group",
+        subject: String = "Программирование"
+    ) = Lesson(
+        raw = raw,
+        room = room,
+        group = group,
+        subject = subject,
+        type = LessonType.LECTURE,
+        teacher = teacher
+    )
+}
\ No newline at end of file