| Marcy Arellano | |
| Position: | Point guard |
| Team: | Free agent |
| Nationality: | Filipino |
| Birth Date: | 25 May 1986 |
| Birth Place: | Manila, Philippines |
| Height Ft: | 5 |
| Height In: | 9 |
| Weight Lbs: | 175 |
| High School: | UE (Caloocan) |
| College: | UE |
| Draft Year Pba: | 2009 |
| Draft Round Pba: | 2 |
| Draft Pick Pba: | 14 |
| Draft Team Pba: | Rain or Shine Elasto Painters |
| Career Start: | 2009–2011; 2018 |
| Team1: | Rain or Shine Elasto Painters |
| Years1: | 2009–2010 |
| Team2: | Air21 Express |
| Years2: | 2010–2011 |
| Team3: | Manila Stars |
| Years3: | 2018–2020 |
| Team4: | Quezon City MG |
| Years4: | 2022 |
| Team5: | Manila CityStars / Stars |
| Years5: | 2022–2023 |
| Highlights: |
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Marcelino "Marcy" Valdez Arellano II (born May 25, 1986) is a Filipino professional basketball player who last played for the Manila Stars of the Maharlika Pilipinas Basketball League (MPBL). From 2005 to 2009, he played in the amateur Philippine Basketball League (PBL). Earlier, he played college basketball for the University of the East of the University Athletic Association of the Philippines (UAAP), where he won the UAAP Rookie of the Year in UAAP Season 67.[1] [2]
In February 2024, Arellano is one of the 47 players banned by the MPBL for alleged involvement in game fixing.[3]
|-| align=left| | align=left| Rain or Shine| 29 || 9.7 || .347 || .143 || .577 || 1.2 || 1.1 || .6 || .0 || 2.5|-| align=left| | align=left| Air21| 7 || 9.1 || .333 || .000 || .375 || 1.3 || 1.4 || .7 || .0 || 1.3|-class=sortbottom| align=center colspan=2 | Career| 36 || 9.6 || .345 || .129 || .529 || 1.2 || 1.2 || .6 || .0 || 2.2