Sededema

{{Infobox river

| name = Sededema

| other_name = Седедема / Сэдэдэмэ

| image =

| image_caption =

| source1_location =Alazeya Plateau

| mouth = Kolyma

| mouth_location =

| mouth_coordinates = {{coord|67.0938|N|153.0278|E|source:wikidata|display=it}}

| progression = {{RKolyma}}

| subdivision_type1 = Country

| subdivision_name1 = Russia

| length = {{convert|567|km|mi|abbr=on}}

| source1_elevation =

| discharge1_avg =

| basin_size = {{convert|18500|km2|sqmi|abbr=on}}

| pushpin_map = Russia Sakha Republic

| pushpin_map_size =

| pushpin_map_caption= Mouth location in Yakutia, Russia

}}

The Sededema ({{langx|ru|Седедема}}; {{langx|sah|Сэдэдэмэ}}, Sededeme) is a river in Sakha Republic, Russia. It is a left tributary of the Kolyma.{{GSEn|100736|Седедема}} It is {{convert|567|km}} long, and has a drainage basin of {{convert|18500|km2}}.{{GVR|268360|Река Седедема (Федотиха, в верх. Ср. Седедема)}}