Offense Up (Japanese: オフェンスアップ Offense Up), also written as OffenseUp, is a PSI ability that appears in the Mother video game series. It increases the amount of damage one or more ally can deal to an enemy. Offense Up α increases the offense of one ally while Offense Up Ω inceases offense on all allies. Offense Up is learned in EarthBound Beginnings by Ninten, in EarthBound by Paula, and in Mother 3 by Lucas.
Lucas using offense up.
In EarthBound Beginnings
| Users | PP Cost | Target | Effect | Description |
| Ninten | 6 | To one of us | Raise the Offense of one party member. | Raises one ally's Offense for the duration of the battle. |
In EarthBound
| Level | Users | PP Cost | Target | Effect | Comments | Description |
| α | Paula | 10 | To one of us | N/A | Offense increases for the duration of the battle. | Increase one person's Offense for the duration of the current battle. It is most effective if you use this power multiple times to "layer" the effect. |
| Ω | Paula | 30 | To all of us | N/A | Everyone's Offense increases to a maximum of twice the original amount. | Increase everyone's Offense for the duration of the current battle. It is most effective if you use this power multiple times to "layer" the effect. |
In Mother 3
| Level | Users | PP Cost | Target | Effect | Description |
| α | Lucas,
Level 14 |
6 | To one of us | Raises Offense | Raises one ally's Offense. Effective when stacked. |
| Ω | Lucas,
Level 36 |
18 | To all of us | Raises Offense | Raises all allies' Offense. Effective when stacked. |