diff --git a/protonmail/calendar.go b/protonmail/calendar.go
new file mode 100644
index 0000000..51788b5
--- /dev/null
+++ b/protonmail/calendar.go
@@ -0,0 +1,99 @@
+package protonmail
+
+import (
+	"net/http"
+	"net/url"
+	"strconv"
+)
+
+type CalendarFlags int
+
+type Calendar struct {
+	ID          string
+	Name        string
+	Description string
+	Color       string
+	Display     int
+	Flags       CalendarFlags
+}
+
+type CalendarEventPermissions int
+
+type CalendarEvent struct {
+	ID                string
+	CalendarID        string
+	CalendarKeyPacket string
+	CreateTime        int64
+	LastEditTime      int64
+	Author            string
+	Permissions       CalendarEventPermissions
+	SharedKeyPacket   string
+	SharedEvents      []CalendarEventCard
+	CalendarEvents    interface{}
+	PersonalEvent     []CalendarEventCard
+}
+
+type CalendarEventCardType int
+
+type CalendarEventCard struct {
+	Type      CalendarEventCardType
+	Data      string
+	Signature string
+	MemberID  string
+}
+
+func (c *Client) ListCalendars(page, pageSize int) ([]*Calendar, error) {
+	v := url.Values{}
+	v.Set("Page", strconv.Itoa(page))
+	if pageSize > 0 {
+		v.Set("PageSize", strconv.Itoa(pageSize))
+	}
+
+	req, err := c.newRequest(http.MethodGet, "/calendars?"+v.Encode(), nil)
+	if err != nil {
+		return nil, err
+	}
+
+	var respData struct {
+		resp
+		Calendars []*Calendar
+	}
+	if err := c.doJSON(req, &respData); err != nil {
+		return nil, err
+	}
+
+	return respData.Calendars, nil
+}
+
+type CalendarEventFilter struct {
+	Start, End     int64
+	Timezone       string
+	Page, PageSize int
+}
+
+func (c *Client) ListCalendarEvents(calendarID string, filter *CalendarEventFilter) ([]*CalendarEvent, error) {
+	v := url.Values{}
+	v.Set("Start", strconv.FormatInt(filter.Start, 10))
+	v.Set("End", strconv.FormatInt(filter.End, 10))
+	v.Set("Timezone", filter.Timezone)
+	v.Set("Page", strconv.Itoa(filter.Page))
+	if filter.PageSize > 0 {
+		v.Set("PageSize", strconv.Itoa(filter.PageSize))
+	}
+
+	req, err := c.newRequest(http.MethodGet, "/calendars/"+calendarID+"/events?"+v.Encode(), nil)
+	if err != nil {
+		return nil, err
+	}
+
+	var respData struct {
+		resp
+		Events []*CalendarEvent
+	}
+	if err := c.doJSON(req, &respData); err != nil {
+		return nil, err
+	}
+
+	return respData.Events, nil
+
+}