diff --git a/internal/config/config.go b/internal/config/config.go
index 7134761..0fabc8d 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -80,3 +80,11 @@ func (c *Config) SetActiveBoardLists(projectID, listIDs string) {
 	}
 	c.ProjectLists[projectID] = listIDs
 }
+
+// ClearProjectLists removes the persisted board filter for a project.
+func (c *Config) ClearProjectLists(projectID string) {
+	if c.ProjectLists == nil {
+		return
+	}
+	delete(c.ProjectLists, projectID)
+}
diff --git a/internal/project/store.go b/internal/project/store.go
index 43e6edc..79f075f 100644
--- a/internal/project/store.go
+++ b/internal/project/store.go
@@ -11,6 +11,7 @@ import (
 type Store interface {
 	List() ([]Project, error)
 	Ensure(id string) error
+	Delete(id string) error
 }
 
 // DirStore discovers projects as subdirectories of dataDir/projects.
@@ -63,3 +64,25 @@ func (s *DirStore) Ensure(id string) error {
 	}
 	return nil
 }
+
+// Delete removes the project directory and all of its files.
+func (s *DirStore) Delete(id string) error {
+	if id == "" {
+		return fmt.Errorf("project id is required")
+	}
+	dir := filepath.Join(s.projectsRoot(), id)
+	st, err := os.Stat(dir)
+	if err != nil {
+		if os.IsNotExist(err) {
+			return fmt.Errorf("project %s: not found", id)
+		}
+		return fmt.Errorf("stat project %s: %w", id, err)
+	}
+	if !st.IsDir() {
+		return fmt.Errorf("project %s: not a directory", id)
+	}
+	if err := os.RemoveAll(dir); err != nil {
+		return fmt.Errorf("delete project %s: %w", id, err)
+	}
+	return nil
+}
diff --git a/internal/project/store_test.go b/internal/project/store_test.go
new file mode 100644
index 0000000..4e061db
--- /dev/null
+++ b/internal/project/store_test.go
@@ -0,0 +1,46 @@
+package project_test
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+
+	"task/internal/project"
+)
+
+func TestDirStoreDelete(t *testing.T) {
+	dir := t.TempDir()
+	store := project.NewDirStore(dir)
+
+	if err := store.Ensure("inbox"); err != nil {
+		t.Fatal(err)
+	}
+	if err := store.Ensure("client"); err != nil {
+		t.Fatal(err)
+	}
+	// Drop a marker file so RemoveAll has something to wipe.
+	marker := filepath.Join(dir, "projects", "client", "tickets.json")
+	if err := os.WriteFile(marker, []byte("[]\n"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+
+	list, err := store.List()
+	if err != nil || len(list) != 2 {
+		t.Fatalf("list before: %v len=%d", err, len(list))
+	}
+
+	if err := store.Delete("client"); err != nil {
+		t.Fatal(err)
+	}
+	list, err = store.List()
+	if err != nil || len(list) != 1 || list[0].ID != "inbox" {
+		t.Fatalf("list after: %v %+v", err, list)
+	}
+	if _, err := os.Stat(filepath.Join(dir, "projects", "client")); !os.IsNotExist(err) {
+		t.Fatalf("client dir still present: %v", err)
+	}
+
+	if err := store.Delete("missing"); err == nil {
+		t.Fatal("expected error deleting missing project")
+	}
+}
diff --git a/internal/ticket/jsontimestore.go b/internal/ticket/jsontimestore.go
index b7522ab..79949bb 100644
--- a/internal/ticket/jsontimestore.go
+++ b/internal/ticket/jsontimestore.go
@@ -153,6 +153,28 @@ func (s *JSONTimeStore) Delete(id string) error {
 	return s.writeUnlocked(out)
 }
 
+// DeleteByProject removes all time entries for a project.
+func (s *JSONTimeStore) DeleteByProject(projectID string) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+
+	if projectID == "" {
+		return fmt.Errorf("projectId is required")
+	}
+	entries, err := s.readUnlocked()
+	if err != nil {
+		return err
+	}
+	out := make([]TimeEntry, 0, len(entries))
+	for _, e := range entries {
+		if e.ProjectID == projectID {
+			continue
+		}
+		out = append(out, e)
+	}
+	return s.writeUnlocked(out)
+}
+
 // SumByTicket returns total duration for a ticket.
 func (s *JSONTimeStore) SumByTicket(ticketID string) (time.Duration, error) {
 	entries, err := s.ListByTicket(ticketID)
diff --git a/internal/ticket/jsontimestore_test.go b/internal/ticket/jsontimestore_test.go
index 04ed661..0e846b7 100644
--- a/internal/ticket/jsontimestore_test.go
+++ b/internal/ticket/jsontimestore_test.go
@@ -69,3 +69,25 @@ func TestJSONTimeStoreRoundTrip(t *testing.T) {
 		t.Fatalf("after delete: %v len=%d path=%s", err, len(list), filepath.Join(dir, "time_entries.json"))
 	}
 }
+
+func TestJSONTimeStoreDeleteByProject(t *testing.T) {
+	dir := t.TempDir()
+	store := ticket.NewJSONTimeStore(dir)
+
+	for _, e := range []ticket.TimeEntry{
+		{TicketID: "a", ProjectID: "p1", Duration: time.Hour, Source: ticket.SourceManual},
+		{TicketID: "b", ProjectID: "p1", Duration: time.Minute, Source: ticket.SourceManual},
+		{TicketID: "c", ProjectID: "p2", Duration: 30 * time.Minute, Source: ticket.SourceManual},
+	} {
+		if _, err := store.Create(e); err != nil {
+			t.Fatal(err)
+		}
+	}
+	if err := store.DeleteByProject("p1"); err != nil {
+		t.Fatal(err)
+	}
+	list, err := store.List()
+	if err != nil || len(list) != 1 || list[0].ProjectID != "p2" {
+		t.Fatalf("after DeleteByProject: %v %+v", err, list)
+	}
+}
diff --git a/internal/ticket/timestore.go b/internal/ticket/timestore.go
index 64e8789..38418ba 100644
--- a/internal/ticket/timestore.go
+++ b/internal/ticket/timestore.go
@@ -9,6 +9,7 @@ type TimeStore interface {
 	Create(e TimeEntry) (TimeEntry, error)
 	Update(e TimeEntry) error
 	Delete(id string) error
+	DeleteByProject(projectID string) error
 	SumByTicket(ticketID string) (time.Duration, error)
 
 	LoadActiveTimer() (*ActiveTimer, error)
diff --git a/internal/ui/app.go b/internal/ui/app.go
index 6ce5e28..3299add 100644
--- a/internal/ui/app.go
+++ b/internal/ui/app.go
@@ -57,32 +57,33 @@ type Model struct {
 	projects  project.Store
 	exec      command.Executor
 
-	mode               Mode
-	tickets            views.TicketList
-	projectList        list.Model
-	statusMenu         views.StatusMenu
-	boardMenu          views.BoardMenu
-	boardFilter        ticket.BoardFilter
-	input              textinput.Model
-	report             views.ReportView
-	reportGroupBy      ticket.GroupBy
-	groupByMenu        views.GroupByMenu
-	timeEntries        views.TimeEntriesView
-	timeEntriesTicket  string // ticket ID for ModeTimeEntries
-	editingTimeEntry   ticket.TimeEntry
-	activeTimer        *ticket.ActiveTimer
-	spentByID          map[string]time.Duration
-	width              int
-	height             int
-	status             string
-	statusIsError      bool
-	filter             string
-	keys               KeyMap
-	styles             Styles
-	version            string
-	allTickets         []ticket.Ticket
-	creatingProject    bool
-	pendingDeleteTitle string
+	mode                 Mode
+	tickets              views.TicketList
+	projectList          list.Model
+	statusMenu           views.StatusMenu
+	boardMenu            views.BoardMenu
+	boardFilter          ticket.BoardFilter
+	input                textinput.Model
+	report               views.ReportView
+	reportGroupBy        ticket.GroupBy
+	groupByMenu          views.GroupByMenu
+	timeEntries          views.TimeEntriesView
+	timeEntriesTicket    string // ticket ID for ModeTimeEntries
+	editingTimeEntry     ticket.TimeEntry
+	activeTimer          *ticket.ActiveTimer
+	spentByID            map[string]time.Duration
+	width                int
+	height               int
+	status               string
+	statusIsError        bool
+	filter               string
+	keys                 KeyMap
+	styles               Styles
+	version              string
+	allTickets           []ticket.Ticket
+	creatingProject      bool
+	pendingDeleteTitle   string
+	pendingDeleteProject string // non-empty → confirm deletes a project, not a ticket
 }
 
 // New creates the root UI model.
@@ -449,12 +450,31 @@ func (m Model) updateBoard(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 func (m Model) updateConfirmDelete(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 	switch {
 	case key.Matches(msg, m.keys.Escape):
+		wasProject := m.pendingDeleteProject != ""
 		m.pendingDeleteTitle = ""
-		m.mode = ModeList
+		m.pendingDeleteProject = ""
 		m.clearStatus()
+		if wasProject {
+			m.mode = ModeProjects
+		} else {
+			m.mode = ModeList
+		}
 		return m, nil
 
 	case key.Matches(msg, m.keys.Enter), key.Matches(msg, m.keys.ConfirmYes):
+		if m.pendingDeleteProject != "" {
+			id := m.pendingDeleteProject
+			m.pendingDeleteTitle = ""
+			m.pendingDeleteProject = ""
+			if err := m.deleteProject(id); err != nil {
+				m.setError(err)
+				m.mode = ModeProjects
+				return m, nil
+			}
+			m.mode = ModeList
+			m.setStatus(fmt.Sprintf("deleted project %s", id))
+			return m, nil
+		}
 		m.pendingDeleteTitle = ""
 		m.mode = ModeList
 		if err := m.deleteSelected(); err != nil {
@@ -712,6 +732,38 @@ func (m Model) updateProjects(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 		m.input.Focus()
 		return m, textinput.Blink
 
+	case key.Matches(msg, m.keys.DeleteForce):
+		m.clearStatus()
+		item, ok := m.projectList.SelectedItem().(views.ProjectItem)
+		if !ok {
+			m.setError(fmt.Errorf("no project selected"))
+			return m, nil
+		}
+		if err := m.deleteProject(item.Project.ID); err != nil {
+			m.setError(err)
+			return m, nil
+		}
+		m.mode = ModeList
+		m.setStatus(fmt.Sprintf("deleted project %s", item.Project.ID))
+		return m, nil
+
+	case key.Matches(msg, m.keys.Delete):
+		m.clearStatus()
+		item, ok := m.projectList.SelectedItem().(views.ProjectItem)
+		if !ok {
+			m.setError(fmt.Errorf("no project selected"))
+			return m, nil
+		}
+		n, err := m.countTickets(item.Project.ID)
+		if err != nil {
+			m.setError(err)
+			return m, nil
+		}
+		m.pendingDeleteProject = item.Project.ID
+		m.pendingDeleteTitle = fmt.Sprintf("project %q (%d tickets)", item.Project.ID, n)
+		m.mode = ModeConfirmDelete
+		return m, nil
+
 	case key.Matches(msg, m.keys.Enter):
 		item, ok := m.projectList.SelectedItem().(views.ProjectItem)
 		if !ok {
@@ -942,6 +994,80 @@ func (m *Model) switchProject(id string) error {
 	return m.reloadTickets()
 }
 
+func (m *Model) countTickets(projectID string) (int, error) {
+	tickets, err := m.store.List(projectID)
+	if err != nil {
+		return 0, err
+	}
+	return len(tickets), nil
+}
+
+func (m *Model) deleteProject(id string) error {
+	if id == "" {
+		return fmt.Errorf("no project selected")
+	}
+	all, err := m.projects.List()
+	if err != nil {
+		return err
+	}
+	if len(all) <= 1 {
+		return fmt.Errorf("cannot delete the last project")
+	}
+
+	wasActive := m.cfg.ActiveProject == id
+
+	// Clear running timer if it belongs to this project.
+	if m.activeTimer != nil && m.activeTimer.ProjectID == id && m.timeStore != nil {
+		if err := m.timeStore.SaveActiveTimer(nil); err != nil {
+			return err
+		}
+		m.activeTimer = nil
+	}
+
+	if m.timeStore != nil {
+		if err := m.timeStore.DeleteByProject(id); err != nil {
+			return err
+		}
+	}
+	if err := m.projects.Delete(id); err != nil {
+		return err
+	}
+
+	m.cfg.ClearProjectLists(id)
+	if wasActive {
+		next := pickFallbackProject(all, id)
+		m.cfg.ActiveProject = next
+		m.boardFilter = ticket.ParseBoardLists(m.cfg.ActiveBoardLists(next))
+		m.filter = ""
+	}
+	if err := config.Save(m.cfg); err != nil {
+		return err
+	}
+	if err := m.openProjects(); err != nil {
+		return err
+	}
+	return m.reloadTickets()
+}
+
+func pickFallbackProject(all []project.Project, deletedID string) string {
+	var rest []string
+	for _, p := range all {
+		if p.ID == deletedID {
+			continue
+		}
+		rest = append(rest, p.ID)
+	}
+	for _, id := range rest {
+		if id == config.DefaultProject {
+			return id
+		}
+	}
+	if len(rest) > 0 {
+		return rest[0]
+	}
+	return config.DefaultProject
+}
+
 func (m *Model) openProjects() error {
 	projects, err := m.projects.List()
 	if err != nil {
diff --git a/internal/ui/helpbar.go b/internal/ui/helpbar.go
index 86a2b2e..acfeb71 100644
--- a/internal/ui/helpbar.go
+++ b/internal/ui/helpbar.go
@@ -33,6 +33,8 @@ func (m Model) helpEntries() []helpEntry {
 			{"a-z", "jump"},
 			{"enter", "select"},
 			{"n", "new project"},
+			{"x", "delete"},
+			{"X", "force delete"},
 			{"esc", "cancel"},
 		}
 	case ModeStatus:
diff --git a/internal/ui/layout.go b/internal/ui/layout.go
index 687496b..bd915b2 100644
--- a/internal/ui/layout.go
+++ b/internal/ui/layout.go
@@ -91,9 +91,18 @@ func (m Model) renderBody(height int) string {
 	case ModeConfirmDelete:
 		title := m.pendingDeleteTitle
 		if title == "" {
-			title = "this ticket"
+			if m.pendingDeleteProject != "" {
+				title = "this project"
+			} else {
+				title = "this ticket"
+			}
+		}
+		var prompt string
+		if m.pendingDeleteProject != "" {
+			prompt = m.styles.ErrorMsg.Render(fmt.Sprintf("Delete %s?", title))
+		} else {
+			prompt = m.styles.ErrorMsg.Render(fmt.Sprintf("Delete %q?", title))
 		}
-		prompt := m.styles.ErrorMsg.Render(fmt.Sprintf("Delete %q?", title))
 		hint := m.styles.StatusMsg.Render("y/enter confirm · esc cancel")
 		content := prompt + "\n" + hint
 		return lipgloss.NewStyle().Height(height).Width(m.width).Render(content)