Diether Sweeck

{{Infobox cyclist

| name = Diether Sweeck

| image = Tongeren - Ronde van Limburg, 14 juni 2015 (B051).JPG

| image_size =

| caption = Sweeck in 2015

| fullname = Diether Sweeck

| nickname =

| birth_date = {{bda|1993|12|17|df=y}}

| birth_place = Leuven, Belgium

| height = 1.80 m

| weight = 71 kg

| currentteam =

| disciplines = {{ubl|Cyclo-cross|Road}}

| role = Rider

| ridertype =

| amateuryears1 = 2013

| amateurteam1 = KDL–Trans

| amateuryears2 =

| amateurteam2 =

| proyears1 = 2014–2017

| proteam1 = {{UCI team code|ERA|2014a}}

| proyears2 = 2018–2019

| proteam2 = {{UCI team code|PSV|2018}}

| proyears3 = 2019–2020

| proteam3 = {{UCI team code|PSB|2019}}

| proyears4 = 2020–2021

| proteam4 = {{UCI team code|AFC|2020}} (road){{cite web|url=https://www.uci.org/road/teams/TeamDetail/14226/1001488/266|title=Alpecin - Fenix|work=UCI.org|publisher=Union Cycliste Internationale|accessdate=13 August 2020|archiveurl=https://archive.today/20200813005131/https://www.uci.org/road/teams/TeamDetail/14226/1001488/266|archivedate=13 August 2020}}{{cite web|url=https://www.uci.org/road/teams/TeamDetail/15247/1001488/280|title=Alpecin-Fenix|work=UCI.org|publisher=Union Cycliste Internationale|accessdate=3 January 2021|archiveurl=https://archive.today/20210103222800/https://www.uci.org/road/teams/TeamDetail/15247/1001488/280|archivedate=3 January 2021}}

| proyears5 = 2020–2022

| proteam5 = Credishop–Fristads{{cite web|url=https://www.uci.org/cyclo-cross/teams/TeamDetail/15209/2003386/271|title=Credishop-Fristads|work=UCI.org|publisher=Union Cycliste Internationale|accessdate=3 January 2021|archiveurl=https://archive.today/20210103232236/https://www.uci.org/cyclo-cross/teams/TeamDetail/15209/2003386/271|archivedate=3 January 2021}} (cyclo-cross)

| proyears6 = 2021

| proteam6 = {{UCI team code|AFD|2021}}{{cite web|url=https://www.uci.org/road/teams/TeamDetail/15290/2003526/276|title=Alpecin-Fenix Development Team|work=UCI.org|publisher=Union Cycliste Internationale|accessdate=8 May 2021|archiveurl=https://web.archive.org/web/20210508151316/https://www.uci.org/road/teams/TeamDetail/15290/2003526/276|archivedate=8 May 2021}} (road)

| majorwins =

| medaltemplates =

| show-medals =

}}

Diether Sweeck (born 17 December 1993 in Leuven) is a Belgian cyclist, who last rode for UCI Cyclo-cross team IKO–Crelan.

Sweeck is the grandson of former cyclist Alfons Sweeck. His twin brother Laurens Sweeck and his older brother Hendrick Sweeck are also professional cyclists.